Myokit

- Update to ide: Can now add/remove comments.
- Bugfixes to protocol reading in `AbfFile`.
- Bugfix in `AbfFile` string reading.
- DataLog viewer now opens multiple files if specified on the command line.
- Fix to OpenCL sim reserved names list.
- Various tweaks and fixes.

- Fixed bug in IDE.
- Fix to windows start menu icons.

- Updated online examples.
- Bugfix in deprecated method `Protocol.guess_duration()`.

- Fixed bug with auto-indenting and smart up/down arrows in IDE.
- Fixed bug in parsing of indented multi-line meta-data properties.
- Fixed bug with `[[script]]` sections being added to files when saved.
- Slight update to `DataLog.apd()`.
- Updated the docs of both apd methods to make clear that they use fixed thresholds.

- Added hybrid PSO option to `myokit.lib.fit`.
- Added option to return multiple particles' results to PSO.
- Bugfixes and updates to documentation.
- Added BFGS method (interface to scipy) to `myokit.lib.fit`.

- Small bugfix in markov simulation class.