CHG: functions without parameter list doesn't have a sub_tree (set property sub_tree to false instead of an empty array)

git-svn-id: https://php-sql-parser.googlecode.com/svn/trunk@1349 44dcfd11-89b7-3d55-2063-5c365055f77f
CHG: the column name has been changed from column to col, column is a reserved keyword, the parser doesn't categorize it as colref, I have add a TODO into the processor.

git-svn-id: https://php-sql-parser.googlecode.com/svn/trunk@1350 44dcfd11-89b7-3d55-2063-5c365055f77f
Merge branch 'svnsync'

CHG: functions without parameter list doesn't have a sub_tree (set property sub_tree to false instead of an empty array)
CHG: the column name has been changed from column to col, column is a reserved keyword, the parser doesn't categorize it as colref, I have add a TODO into the processor.