[FIX] Watch if jQuery is overwritted by another version in some script. If an...

[FIX] Watch if jQuery is overwritted by another version in some script. If an override is detected, we check that all old function is always present else we add the missing. 
The problem was that some websites uses externals libraries which use a jQuery more recent that our version. Jquery by default  checks his own version  and overwrite itself if the current version is lower.
Once user had their jquery overwritted, function dropdown was missing and it was impossible to the end user to get menu working again... and so impossible to remove the view with the front end.

bzr revid: jke@openerp.com-20140414151423-zhi3tjj52rihltzy