[IMP] doc/howtos/backend: add section on wizards
[FIX] portal_sale: portals are not allowed to see payments

Portal users are not allowed to read account.move.line model
Therefore, in the portal, if you let the payments in the invoice view, the portal user is warned that he is not allowed to see account.move.line
[IMP] Increase statics cache from 12 hours to 1 week
[FIX] survey: in prepare_result, result_summary variable could be returned without being initialized (error in question.type maybe, but anyway should be more secure)
[FIX] website_forum: fixed (un)publish management on the profile. Partners are now also published by default. Better protection of displayed profile: only publis profiles with karma >= 1 are displayed on the forum, to avoid allowing external users to browse the user lists. Some cleaning / improvements in the bio edit form that was a bit buggy.