Fixed non Sys11 bugs and added ACRelay support

* Fixed some bugs introduced by experimental System 11 support that had broken non-System 11 (e.g., WPC) support.  Sorry about that!
* Added in System11 ACRelay 'renumbering' (a/k/a lying) like pinmame does. (Pinmame sends different coil numbers if the ACRelay is on!)  Should mean fewer changes to run stock tables.  NOTE: I assume your ACRelay is at Coil 12.  If not, this will not work.