#935 PLCgen: CifProcessor collects results, target distributes them.

Main PLCgen function needs more control on how the PLC code gets built. This implies that generators must do less back-door transport to other generators.

Less back-door transport also enhances clarity in what is happening in the code.

End-user visible changes:

• Some variables and statements may be in a different order in the generated PLC code.

Addresses #935 (closed)