Now uses common.php "createFieldMap()" function for fieldname checking. Also checks token fields availability before generating join with tokens table (for backwards compatability with token tables that don't have attribute_1 and attribute_2 fields)

git-svn-id: file:///Users/Shitiz/Downloads/lssvn/trunk/unstable@1070 b72ed6b6-b9f8-46b5-92b4-906544132732