[FIX] avoid showing Comment button etc if $prefs.wiki_comments_allow_per_page is set to 'o' ie default off and individual page comment setting is also 'off'

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@49057 b456876b-0849-0410-b77d-98878d47e9d5
[FIX] When using override_perms=true because if user adding himself to group may not have perms yet, tracker item was still not being categorized if user can't see cat yet

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@49058 b456876b-0849-0410-b77d-98878d47e9d5