mjsousa [Wed, 06 Aug 2014 10:43:15 +0100] rev 920
Fix bug (introduced a few commits ago) when generating SFC actions that are mapped onto variables --> Make generate_sfcdecl_c stateless (i.e. does not depend on order by which it is called).
mjsousa [Thu, 31 Jul 2014 17:49:44 +0100] rev 919
Add support for the 'NULL' keyword, defined in version 3 of IEC 61131-3.