[IMP] ir.logging: add index on dbname/type, important with high number of log lines
[FIX] website: more robust inherit between footer_custom and footer_default
[REVERT] 8b41906: disabled all on_change on new record form

This reverts commit 8b41906bf8a22e3f00d3ea334f89b7f1aec27442.
Merge branch '8.0' of https://github.com/odoo/odoo into 8.0