yaml_import: allow ids to have non-scalar expressions
yaml_import: allow ids to have non-scalar expressions

In this example
   !record {model: stock.location }:
     location_id: !eval val_from_context
the !eval tag wouldn't be expanded, thus limiting our abilities.
Fixed that, and also allowed the result of !eval to be expanded
just like a scalar value.

xrg/openerp-server,xrg/openerp-server