added test script and expected output file as well
this closes patch 103297.
__all__ attributes will be added to other modules without first submitting
a patch, just adding the necessary line to the test script to verify
more-or-less correct implementation.
support for extension types, not classes.
pickle(): If the type is a class or if the reduction function is not
callable, raise a TypeError.
constructor(): If the constructor is not callable, raise TypeError.
This (partially) closes SourceForge patch #101859.
1. Comments at the beginning of the module, before
functions, and before classes have been turned
into docstrings.
2. Tabs are normalized to four spaces.
Also, removed the "remove" function from dircmp.py, which reimplements
list.remove() (it must have been very old).
