If a field name into the parser definition doesn't exist into the model but is resolved by a callable, call the method. Prior to this change, it was o more possible to define computed json value for custome keys
Rationale:
1. the name reflects better what it does
as this is not _just_ a base module
2. solves publication issue on odoo apps store
due to an old module registered w/ the same name
that even if un-published blocks publishing the module
for all versions.
This in turn, blocks the publication of ALL modules
that depend on base_jsonify.
Laurent Mignon (ACSONE)
Sébastien BEAU
Simone Orsi