smsu: do not be too protective regarding modifications of roles. allow to modify roles even if currently in use
smsu: do not be too protective regarding modifications of roles. allow to modify roles even if currently in use

- useful if you are using many roles at once, including SUPER_ADMIN.
- protecting against users wrong doing is not easy anyway since
  removing the customized_group is not protected whereas it can be more destructive
- role admin can't really delegated!

git-svn-id: ff983b4bcb2c7e6a7cb4f1ce831626e7b8f8ab18@352 fc430c36-7b06-4524-a305-defe264b8bfe

EsupPortail/esup-smsu,EsupPortail/esup-smsu,EsupPortail/esup-smsu