Scour

* Fix regression caused by new feature to merge sibling groups ([260](https://github.com/scour-project/scour/issues/260))

* Fix issue with dropping xlink:href attribute when collapsing referenced gradients ([206](https://github.com/scour-project/scour/pull/206))
* Fix issue with dropping ID while de-duplicating gradients ([207](https://github.com/scour-project/scour/pull/207))
* Improve `--shorten-ids` so it re-maps IDs that are already used in the document if they're shorter ([187](https://github.com/scour-project/scour/pull/187))
* Fix whitespace handling for SVG 1.2 flowed text ([235](https://github.com/scour-project/scour/issues/235))
* Improvement: Merge sibling `<g>` nodes with identical attributes ([208](https://github.com/scour-project/scour/pull/208))
* Improve performance of XML serialization ([247](https://github.com/scour-project/scour/pull/247))
* Improve performance of gradient de-duplication ([248](https://github.com/scour-project/scour/pull/248))
* Some general performance improvements ([249](https://github.com/scour-project/scour/pull/249))

* Fix escaping of quotes in attribute values. ([152](https://github.com/scour-project/scour/pull/152))
* A lot of performance improvements making processing significantly faster in many cases. ([167](https://github.com/scour-project/scour/pull/167), [169](https://github.com/scour-project/scour/pull/169), [171](https://github.com/scour-project/scour/pull/171), [185](https://github.com/scour-project/scour/pull/185))
* Fix exception when removing duplicated gradients while `--keep-unreferenced-defs` is used ([173](https://github.com/scour-project/scour/pull/173))
* Remove some illegal optimizations of `m0 0` sub-path commands ([178](https://github.com/scour-project/scour/pull/178))
* Fix and improve handling of boolean flags in elliptical arc path commands ([183](https://github.com/scour-project/scour/pull/183))
* Fix exception when shorthand transform `scale(1)` with single number is used ([191](https://github.com/scour-project/scour/pull/191))
* Fix exception when using two-number forms of the filter attributes `baseFrequency`, `order`, `radius` and `stdDeviation` ([192](https://github.com/scour-project/scour/pull/192))
* Improve whitespace handling in text nodes fixing an issue where scouring added spaces in error and reducing file size in many cases ([199](https://github.com/scour-project/scour/pull/199))
* Drop official support for Python 3.3. (While it will probably continue to work for a while compatibility is not guaranteed anymore. If you continue to use Scour with Python 3.3 and should find/fix any compatibility issues pull requests are welcome, though.)

* Fix embedding of raster images which was broken in most cases and did not work at all in Python 3. ([120](https://github.com/scour-project/scour/issues/120))
* Some minor fixes for statistics output.
* Greatly improve the algorithm to reduce numeric precision.
* Precision was not properly reduced for some numbers.
* Only use reduced precision if it results in a shorter string representation, otherwise preserve full precision in output (e.g. use "123" instead of "1e2" when precision is set to 1).
* Reduce precision of lengths in `viewBox` ([127](https://github.com/scour-project/scour/issues/127))
* Add option `--set-c-precision` which allows to set a reduced numeric precision for control points.<br/>Control points determine how a path is bent in between two nodes and are less sensitive to a reduced precision than the position coordinates of the nodes themselves. This option can be used to save a few additional bytes without affecting visual appearance negatively.
* Fix: Unnecessary whitespace was not stripped from elliptical paths. ([89](https://github.com/scour-project/scour/issues/89))
* Improve and fix functionality to collapse straight paths segments. ([146](https://github.com/scour-project/scour/issues/146))
* Collapse subpaths of moveto `m` and lineto `l`commands if they have the same direction (before we only collapsed horizontal/vertical `h`/`v` lineto commands).
* Attempt to collapse lineto `l` commands into a preceding moveto `m` command (these are then called "implicit lineto commands")
* Do not collapse straight path segments in paths that have intermediate markers. ([145](https://github.com/scour-project/scour/issues/145))
* Preserve empty path segments if they have `stroke-linecap` set to `round` or `square`. They render no visible line but a tiny dot or square.

* Drop official support for Python 2.6. (While it will probably continue to work for a while compatibility is not guaranteed anymore. If you continue to use Scour with Python 2.6 and should find/fix any compatibility issues pull requests are welcome, though.)
* Fix: Unused IDs were not shortended when `--shorten-ids` was used. ([19](https://github.com/scour-project/scour/issues/62))
* Fix: Most elements were still removed from `<defs>` when `--keep-unreferenced-defs` was used. ([62](https://github.com/scour-project/scour/issues/62))
* Improve escaping of single/double quotes ('/") in attributes. ([64](https://github.com/scour-project/scour/issues/64))
* Print usage information if no input file was specified (and no data is available from `stdin`). ([65](https://github.com/scour-project/scour/issues/65))
* Redirect informational output to `stderr` when SVG is output to `stdout`. ([67](https://github.com/scour-project/scour/issues/67))
* Allow elements to be found via `Document.getElementById()` in the minidom document returned by scourXmlFile(). ([68](https://github.com/scour-project/scour/issues/68))
* Improve code to remove default attribute values and add a lot of new default values. ([70](https://github.com/scour-project/scour/issues/70))
* Fix: Only attempt to group elements that the content model allows to be children of a `<g>` when `--create-groups` is specified. ([98](https://github.com/scour-project/scour/issues/98))
* Fix: Update list of SVG presentation attributes allowing more styles to be converted to attributes and remove two entries (`line-height` and `visibility`) that were actually invalid. ([99](https://github.com/scour-project/scour/issues/99))
* Add three options that work analoguous to `--remove-metadata` (removes `<metadata>` elements) ([102](https://github.com/scour-project/scour/issues/102))
* `--remove-titles` (removes `<title>` elements)
* `--remove-descriptions` (removes `<desc>` elements)
* `--remove-descriptive-elements` (removes all of the descriptive elements, i.e. `<title>`, `<desc>` and `<metadata>`)
* Fix removal rules for the `overflow` attribute. ([104](https://github.com/scour-project/scour/issues/104))
* Improvement: Automatically order all attributes ([105](https://github.com/scour-project/scour/issues/105)), as well as `style` declarations ([107](https://github.com/scour-project/scour/issues/107)) allowing for a constant output across multiple runs of Scour. Before order could change arbitrarily.
* Improve path scouring. ([108](https://github.com/scour-project/scour/issues/108))<br>Notably Scour performs all caculations with enhanced precision now, guaranteeing maximum accuracy when optimizing path data. Numerical precision is reduced as a last step of the optimization according to the `--precision` option.
* Fix replacement of removed duplicate gradients if the `fill`/`stroke` properties contained a fallback. ([109](https://github.com/scour-project/scour/issues/109))
* Fix conversion of cubic Bézier "curveto" commands into "shorthand/smooth curveto" commands. ([110](https://github.com/scour-project/scour/issues/110))
* Fix some issues due to removal of properties without considering inheritance rules. ([111](https://github.com/scour-project/scour/issues/111))

* Add a function to sanitize an arbitrary Python object containing options for Scour as attributes (usage: `Scour.sanitizeOptions(options)`).<br>This simplifies usage of the Scour module by other scripts while avoiding any compatibility issues that might arise when options are added/removed/renamed in Scour. ([44](https://github.com/scour-project/scour/issues/44))
* Input/output file can now be specified as positional arguments (e.g. `scour input.svg output.svg`). ([46](https://github.com/scour-project/scour/issues/46))
* Improve `--help` output by intuitively arranging options in groups. ([46](https://github.com/scour-project/scour/issues/46))
* Add option `--error-on-flowtext` to raise an exception whenever a non-standard `<flowText>` element is found (which is only supported in Inkscape). If this option is not specified a warning will be shown. ([53](https://github.com/scour-project/scour/issues/53))
* Automate tests with continouous integration via Travis. ([52](https://github.com/scour-project/scour/issues/52))