DokuWiki supports a wildcard which gets replaced with the currently loggedin
user in its ACL configuration file.

This patch changes the wildcard from @USER@ to %USER% (case sensitive) and
also makes sure the ACL Manager does not replace the wildcard when displaying
the currently set rules.

The change was needed for better compatibility with the User Manager without
complicating the code. The old @USER@ wildcard is still supported, but
changing an ACL rule using it, through the ACL manager will fail.

It is recommended to update ACL rules using the @USER@ wildchar to use the
new %USER% one instead.

darcs-hash:20081216171126-7ad00-94ce0c2afa411abc936f13572efd0e31941901ee.gz