more optimization:
-use utf8 for DB instead of utf16 (is it ok for langs like jp?): reduces db size by half
-store wordIndex in DB instead of memoryhash: increases db size by factor 1.3, decreases ram usage from 35mb to 25mb (18mb of which is libs) while kdelibs4.po is opened, +project and glossary loaded warning: this is not the last db scheme breakage :)
-split wordIndex into two ones: one is _preferred_ for strings with < 20 words, and vice versa
-use qlist instead of qvector for suggestions: really helps when qSorting
-use qvector instead of qstringlist for catalogitems: win ~200 kb when kstars.po is opened

features:
-added predefined list of language mailinglists to set the default value for project settings