[FIX] evaluate compound context from treeview before executing action

not actually sure if ActionManager#do_action is supposed to get a literal or a nonliteral context at this point... but ViewManager(Action) does not seem to like nonlit contexts at all so...

lp bug: https://launchpad.net/bugs/933360 fixed

bzr revid: xmo@openerp.com-20120217093541-pudzg8x4u1dhbkjf