Fix 0008396: Don't allow creating tags if user can't attach them
(note) bug_view_advanced_page.php, bug_view_page.php and tag_attach.php were committed
in error without this info.

git-svn-id: http://mantisbt.svn.sourceforge.net/svnroot/mantisbt/trunk@4600 <a class="text" href="/?p=mantisbt.git;a=object;h=f5dc347c">f5dc347c</a>-c33d-0410-90a0-b07cc1902cb9