Thanks to Matt Harden.

hanging or long-running tests. Patch by Adam Olsen.

the size of the buffer more quickly.

Added note to documentation about copy_reg rename.

Renamed copy_reg to copyreg in the standard library, to avoid
spurious warnings and ease later merging to py3k branch. Public
documentation remains intact.

Factored the import guard in test_py3kwarn.TestStdlibRemovals into
a context manager, namely test_support.CleanImport.

one.

I am amazed that the old code, for inserting null-bytes, actually
worked. Who wrote that thing? Oh, it is me... doh.