Iromlab

- Added button to set PPN / Title to last entered value
- Added button to continue numbering from previous carrier
- Numbering continues across carrier types within a PPN (no reset to 1 for a new carrier type)
- For each carrier a copy of the KB-MDO record is now saved as well.
- Updated documentation accordingly

The main features in this release are:

PPN lookup can now be disabled

This is particularly useful for materials that are not part of the KB collection (and thus don't have an associated PPN identifier). PPN lookup can be disabled by setting the value of *enablePPNLookup* in the configuration file to *False*. See also the [setup and configuration documentation](https://github.com/KBNLresearch/iromlab/blob/master/doc/setupIromlab.md#enableppnlookup). If *enablePPNLookup* is disabled, the *PPN* data entry widget in Iromlab's data entry GUI is replaced with *Title* widget. See also the section about [Processing discs that are not part of the KB collection](https://github.com/KBNLresearch/iromlab/blob/master/doc/userGuide.md#processing-discs-that-are-not-part-of-the-kb-collection) in the User Guide.

DFXML output

For data discs, Iromlab now uses Isobuster's new functionality to generate reports in Digital Forensics XML (DFXML) format. Note that currently the generated DFXML does not validate against the DFXML schema; details can be found [here](https://github.com/KBNLresearch/iromlab/issues/59#issuecomment-356345043). These issues will most likely be addressed in future versions of Iromlab/IsoBuster.

Upgrading from previous versions

If you upgrade from a previous version of Iromlab, you will need to add an *enablePPNLookup* element to your configuration file. See the [explanation here](https://github.com/KBNLresearch/iromlab/blob/master/doc/setupIromlab.md#enableppnlookup). Also, DFXML output only works for Isobuster 4.1 onward. Older versions of Isobuster may not work at all.

Main changes relative to 0.6.3 version:

- Iromlab is now compatible with the latest version of Isolyzer
- Various changes to improve conformance to PEP 8 / Pylint
- Changed to wheel package distributions. Since wheel distributions don't appear to support post-install steps (copying of configuration files, creation of desktop icons), these were moved to a separate configuration tool that has to be run once by the user. This is all [explained in the updated documentation](https://github.com/KBNLresearch/iromlab/blob/master/doc/setupIromlab.md#configuration). A bit annoying but nothing to do about it.