Remove trailing whitespace
Add default name
Use MergeStringList, not FlattenList

This library routine needs to convert a list of strings to a single string,
but previously used the routine to convert from a list of depth 2 to a list
of depth 1
Ensure defaults are used

For NestedWorkflow and RActivity, ensure the additional keyword parameters
are passed to the underlying Activity class.

Also, small bug fix where RACtivity used incorrect attribute of Activity
class.
MPM examples work correctly again