copying swatch into working branch


git-svn-id: svn+ssh://svn.cern.ch/reps/cactus/branches/kreczko_swatch_arguments/swatch@31254 4525493e-7705-40b1-a816-d608a930855b
Ref #767: replaced core::Arguments with core::ParameterSet
Ref #767: changed name of function parameter of type ParameterSet to "params" where applicable