Refactor for Paulus' pypcc2 version with arrays

This implements most of what is needed for Paulus' array refactoring.

Issues:

• When I run the code there's an issue with numpy.split. I do not know numpy good enough yet to solve ot now.
• Paulus uses mixed case labels and literals with digits (LED0) for MPs/CPs. Need to ask him what's what.

RCUSCC/RCUSCC/RCUSCC.py

@@ -166,7 +166,7 @@ class RCUSCC(Device):
     )
 
     RCU_monitor_rate_RW = attribute(
-        dtype='DevULong64',
+        dtype='DevDouble',
     )