[MOD] remove from screen the duplicate category related prefs

git-svn-id: file:///var/local/code.tiki.org/tikisvn/trunk@53224 b456876b-0849-0410-b77d-98878d47e9d5
[MOD] make help to use icon set

git-svn-id: file:///var/local/code.tiki.org/tikisvn/trunk@53225 b456876b-0849-0410-b77d-98878d47e9d5