Fixing Catalyst for the programmable filter.

The programmable filter can have '\n' in the script section
strings and this was causing problems. This converts the '\n'
to a '\\n' in the script that is run so that users can use
programmable filters the way they normally do in ParaView.

Change-Id: Ia4779fdbb5d233a161821053888c8ac03bc46e46
Merge topic '14983_catalyst_programmablefilter' into next

f028fbfe Fixing Catalyst for the programmable filter.