mjsousa [Sun, 02 Mar 2014 16:42:56 +0000] rev 873
Add limited support for the REF() operator (defined in v3 of IEC 61131-3)
mjsousa [Mon, 24 Feb 2014 22:00:55 +0000] rev 872
Remove assertion being failed by IL labels (IL labels do not yet have specific datatypes).