Topic/plat 6640 part2

This is the bulk of the new caplet stripping code. The idea is to have a system that makes it easy to add new models. Only a few models are implemented here. Note, some tests are marked as TestGroup.UNIT_SLOW, which will reduce the test coverage on systems that do not run these tests.   
Delete this or "_nModelParms = _volFunc.getLengthOfDomain();" 2 lines below.