[IMP] module loading and tests profiling

Add a loglevel 25 to log some INFO to runbot
Add timers for loading and testing
Silence empty test suite
[IMP] test impprove HTTPCase opener

Simplify website crawler using the generic HTTPCase opener
[IMP] ir_logggin log relative pathname

Warning this doesnt work for --addons-path modules yet.
Merge branch 'master' of https://github.com/odoo/odoo into pep8