Fixes handling of accounting/invoicing-related fields on partners
that are not "commercial entities" (either marked as "is_company"
or parentless).
The corresponding fields are also hidden from form views on these
partners and replaced by a short sentence and a link to edit the
"master fields" on the commercial entity.
This corresponds to part B of the solution described on bug 1160365.
lp bug: https://launchpad.net/bugs/1160365 fixed
bzr revid: odo@openerp.com-20130407235013-j3tv4uxy46eej43i