[MERGE] ir_values cleanup (and a bugfix).

The main changes are:
- obsolete columns have been removed totally from ir.values (the meta* stuff, and the object column)
- existing columns have been documented, but preserved
- the set() and get() methods are deprecated, and internally delegate their tasks to the new set_action/get_actions and set_default/get_defaults.
- the API is now documented
- the administration UI for ir.values has been split in 2: defaults and action bindings now have their own menus and views
- added some new YAML (smoke-)tests.

bzr revid: vmt@openerp.com-20111003161404-s5wjo99q90oi435q