- Replace current 2015 Hunspell implementation (by Sergey Ilinykh and
Vitaly Tonkacheyev) with 2009 one by Alexander Tsvyashchenko, which
turned out to be better alternative:
* Much faster (suggestions appear almost instantly vs. several
hundreds milliseconds with the original implementation)
* Better multilanguage support (tested with English and Russian)
* Ability to limit number of suggestions in the settings dialog
* Working "add word to the dictionary" feature
Obtained from: http://endl.ch/content/psi-spell-checking-hunspell-support
