Fixed issue #09328: Language changer causes warning for mandatory questions
Fixed issue #09285: Index complet + mandatory question :undefined notice
Fixed issue #09198: complete group's navigation can stop before clicked group
Fixed issue #08806: questionindex to 2 allow invalid survey submitted
Dev: use $force in _validateGroup and _validateQuestion
Dev: this allow save value in DB for equation and some other, but never return error.
Dev: update EM, then need testing
Dev: refix #09285 2 : condition : go after, do to : broke
Dev: Adding $_SESSION[$LEM->sessid][$answer]=null in _validateQuestion , this ensure using $_SESSION[$LEM->sessid][$answer]
Dev: then remove the quick fix at qanda_helper only for $ia[1] (without sub question)
Dev: remove global $notanswered at each do_ function, get it by GetLastMoveResult
Merge pull request #227 from Shnoulle/master_indexfixes

Dev: Fix complete index bugs and some other jumpTo bug