[FIX] rollback default conversion of js Object to py.object (not py.dict) and add default toJSON to all py.object 
[FIX] rollback default conversion of js Object to py.object (not py.dict) and add default toJSON to all py.object 

* Accesses in contexts & domains are object derefs, so using dicts was
  dumb

* But objects still need to round-trip through in case of e.g. o2m
  commands in contexts, so py.object needs a toJSON (or a special
  object kind needs to be added, specifically for round-tripping
  objects through)


havt/openerp-web,akretion/openerp-web,havt/openerp-web,havt/openerp-web,havt/openerp-web,akretion/openerp-web,havt/openerp-web,akretion/openerp-web