[FIX] http.py: no traceback for SessionExpiredException

Rebase and close #3618
[FIX] Avoid endless loop when doing a return picking
[IMP] models: add check for common conversion error in field definitions
[IMP] Manufacture should be by default in all warehouses
[FIX] action_confirm was not asking for purchase pricelist, otherwise it was asking for sale pricelist
[FIX] packaging: redhat dependencies

Install psycogreen from easy_install (not in EPEL), required for openerp-gevent
Merge pull request #8 from odoo/8.0

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