ORM: limit the columns that browse() fetches from SQL
ORM: limit the columns that browse() fetches from SQL

We usually need browse() records to have a couple of fields from the
db. Fetching all the columns (and processing them) may cost too much,
so only fetch the ones asked (or predicted).

This greatly works around missing columns, from non-upgraded modules.

xrg/openerp-server,xrg/openerp-server