Some changes to help Jelix doc being better referenced on search engines.
* Added a rel="nofollow" on links to page source and editing on github.
* Added a link at the top of pages (when they are not for the current latest release) to the corresponding page of the latest release (with a dumb test, may be we could do better)
Actually, it would be probably better to link to latest release only for oldest release, not for master. There is now an option in profiles.ini.php to enable/disable links to current release page.
Now using hooks in gitiwiki so that links to default branch are output. This avoids putting specific code in gitiwiki.
Added forgotten files and renamed the event as I did in gitiwiki PR.
Merge remote-tracking branch 'bricet/seo1'

Conflicts:
	doc_en/var/config/profiles.ini.php.dist
	doc_fr/var/config/profiles.ini.php.dist
	modules/app/locales/en_US/site.UTF-8.properties
	modules/app/locales/fr_FR/site.UTF-8.properties