[FIX] OPW 575885: read_group result not coherent with search

[FIX] OPW 575885: read_group result not coherent with search

read_group does not respect "Next Partner Entries to reconcile" where
search is overridden to.

=> read_group displays groups with records not available/displayed
   when "Next Partner Entries to reconcile" is applied to the leaves
   (and taken in account by search)

Remaining issue, the GTK client does not currently keep its context
through a read_group tree. Context values set by the search view are
only used for the base read_group, not for subsequent read_group or
search/read calls.

bzr revid: xmo@openerp.com-20120727114303-72bibeqk0xqdlpoi