#220 Upgrade failure due to a 'mysqlRepositorySys' call

[Stéphane Klein]

The upgrade process seems to keep calling the outdated configuration variable 'mysqlRepositorySys' (and expects it to be of 'folder' type instead of 'string'). This may cause an upgrade failure.

See, for example :

http://forum.claroline.net/viewtopic.php?f=47&t=19368&p=46848&hilit=Mysql+base+path#p46848