[ENH] Adding validation to prevent multiple columns from affecting the same value

git-svn-id: file:///var/local/code.tiki.org/tikisvn/trunk@52821 b456876b-0849-0410-b77d-98878d47e9d5
[ENH] Displaying the permName in the field listing

git-svn-id: file:///var/local/code.tiki.org/tikisvn/trunk@52822 b456876b-0849-0410-b77d-98878d47e9d5