Boron 0.5.0

After the issues with both the AppImage and the Windows version seem to be under control, it's time to release the next version of Molsketch. Notable new features include the ability to query Wikidata for molecular structures (well, InChI strings, that is -- requires OpenBabel) and support for explicit lone pairs and radical electrons. Enjoy!

Edit (next morning fixes): there's been a minor fix related to https://sourceforge.net/p/molsketch/bugs/17/#e600/e66b/bd49/53a1/9277, which is not essential if the code is working for you as is. Sorry for the inconvenience.