nsf

   - generic/nsf.c: After several takes, adding support for basic       handling of hidden and re-exposed objects in the sense of [interp       hidden|hide|expose]. I wanted to make sure that NSF does not crash       upon basic hiding/exposing operations (see tests/interp.test) and       guarantees that hidden/re-exposed objects are properly handled when       cleaning up object systems, i.e., the destructors are called and       physical deletion is performed. [interp hidden|hide|expose] is       challenging for NSF (as well as TclOO) because they way it is       implementing effectively modifyies command names *without* providing       any calling back to trace these changes (as for renames). As a       consequence, object and command names start to diverge once an       object has been hidden or re-exposed. As the changes affect the       cleanup machinery in ObjectSystemsCleanup() & friends, I verified       for leaks by running valgrind; no leaks were found running       destroy.test and interp.test.     - tests/interp.test: A test suite that covers basic scenarios of       hiding and exposing objects.     - Makefile.in: Registering interp.test with make env

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