[IMP] ir.model:.fields allow setting ondelete=restrict foncustom fields
[FIX] tools: restrict available attributes
[MERGE] forward port of branch 7.0 up to b601015
[FIX] web: backport of ebb826a and 2372d30

Fixing breadcrumb not being displayed after some action button (e.g. validate invoice, opw 612763)
Forward port of 7.0 up to revision 42680c9

Well actually it's an empty forward port to avoid forward porting last 7.0 commit in saas...
[MERGE] forward port of branch saas-3 up to b5b7dcc
[MERGE] forward port of branch saas-5 up to 163d7f5
[IMP] api: compute methods cannot depend on field 'id'

This feature hasn't been implemented because of complexity problems.
Therefore, we should not allow the developer to use it.