#17409: Document RLIM_INFINITY and use it to clarify the setrlimit docs.
Isuse #17720: Fix APPENDS handling in the Python implementation of Unpickler
to correctly process the opcode when it is used on non-list objects.
Issue #17801: fix shebang line of gprof2html.py
Remove duplicated tests.
Remove trailing whitespace.
Fix reference leak in _pickle.
#17065: Use process-unique key for winreg test.

Patch by Jeremy Kloth.