Expression: fix many2one exprs with 'in' operator [Bug 600216]
Expression: fix many2one exprs with 'in' operator [Bug 600216]

Inspired by Dr. Ferdinard Gassauer, fix by "Anup" <ach@tinyerp.com>

Allow checking of m2o field against string, list, tuple (+ nested expr).

xrg/openerp-server,xrg/openerp-server