Add svn repo and client for the tests
Add versioning support: status, update and diff
Use versioning as ajax
* Option to know if we should support the versioning
* Display the versioning dropdown menu
Remove tabs
* Add function to update the XML for the content of the file.
* For now, we don't care of the versioning value from the ini file: if the key is present, we use subversion
* Support to commit file in the svn repo
* More tests
* Support versioning navigation with pushState