Rules for NmzResult

[w-bruns]

In the following I want to fix some rules for NmzResult (see NormalizModule.cpp) whose behavior has somewhat changed from v.1.12 to the current master.

NmzResult allows the definition of handlers for several output types. The purpose of these handlers is to put the computation results into a human readable format or a format that can be processed by a calling program. See PyNormaliz.py for examples.

The handlers are passed as named parameters to NmzResult and assigned to global variables in NormalizModule.cpp. NmzResult now resets all the handlers to NULL before evaluating the named parameters. Therefore it does no longer remember their values from the previous call.