nsf.c

-nsf.c:
* Added argument "-reg-object" to ::nsf::method::create to
distinguish between a registration and a definition object for
ensemble methods, similar as on other places. If no reg-object is
provided, it is the same as the definition object. One should
take care that the registration objects are deleted after the
definition objects, which is the case for the usages of the
reg-objects in nx/xotcl.
* The namespaces within plain scripted methods and scripted
ensemble objects are now the same.
* Extended regression test