nsf

Recent versions of Tcl9 call Tcl_DupInternalRepProc() for Tcl_ObjType

"nsfParam", which was a placeholder function before, leading to a

Tcl_Abort(). The provided implementation provides now a basic logic

for "duplicating" internal representations of parameter lists based on

refcounts (somewhat similar to ProcBodyDup), but it has to be tested

further, with a proper test case.

The call of the Tcl_DupInternalRepProc function happens so far during

the startup of NaviServer compiled with Tcl9. It might be necessary to

overthink the competing logics of the "canDelete" member and the

reference count. For now, the intention is to get the NaviServer +

Tcl9 regression test stop from aborting.

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