Extend "bookmarkconvert" to convert from Web+ to QupZilla ***Bonus***
completed by: Markus Himmel (TwoFx)
mentors: mmu_man, Adrien Destugues - PulkoMandy, humdinger
Extend "bookmarkconvert" to convert from Web+ to QupZilla.
Rethink the usage options and polish the code and recipe.
Follow-up to https://www.google-melange.com/gci/task/view/google/gci2014/5242103030349824