[FIX] don't display separators in the drawer

now, separators (defined by the tag 'group'!) are only displayed
in the autocomplete and not in the searchview drawer
[IMP] remove useless code

the 'first' attribute is not used anymore
[FIX] fix tests in autocompletion
Merge remote-tracking branch 'odoo/master' into master-autocompletion-ged
[MERGE] web search lazy autocompletion by ged

Search many2one only when they are slected
Remove dependecy on jquery.ui automcomplete.