GUI: switched VO table cells from hyperlink to clickable

 - since we will keep tabs in GUI, hyperlink cell is not
 the best solution (sometimes do not redirect if source tab
 closes first). Get it back to CustomClickableCell but keep
 authz property to use clickable / not clickable lines.
GUI: added unaccented filtering

 - use own implementation of suggest oracle
 - fixed filtering of rich resources (without tags)
 - optimized imports

MultiWordSuggestOracle can't be extended, because of usage PrefixTree, which
is not public, so put modified sources of both into our code and use it.
GUI: fixed copy/paste on search and filter inputs

 - trigger button enabling/disabling for search widget when input
 is full/empty for cut/paste actions too.
 - trigger lookup for suggestions on cut/paste for filter widget
 - fixed button animation/disabling on addMemberToGroup tab
GUI: do not filter unaccented (just suggest unaccented)

 - use unaccent only for SuggestBox suggestions
 - filtering is done accented only with ignore case
Merge pull request #88 from zlamalp/vos

GUI: vos, unaccent, cut/paste on filter/search