[FIX] theme control category filter setting

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/experimental@53364 b456876b-0849-0410-b77d-98878d47e9d5
[FIX] fix php notice when pref is not set

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/experimental@53365 b456876b-0849-0410-b77d-98878d47e9d5
[FIX] switch theme php notices for cases when there is no user_theme pref

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/experimental@53366 b456876b-0849-0410-b77d-98878d47e9d5
[MOD] comments and make sure Custom URL is removed from the available themes

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/experimental@53367 b456876b-0849-0410-b77d-98878d47e9d5
[MOD] Themegenerator is broken, this commit just hides remarksbox by checking if the feature is on

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/experimental@53368 b456876b-0849-0410-b77d-98878d47e9d5