More work on completing the transition to setuptools.
* Mailman/testing -> Mailman/test * Removed Mailman/testing/base.py * Fix mailmanctl by using a different way of calculating where the qrunner script is. The configuration file no longer knows what BIN_DIR is, but the mailmanctl script knows where it lives via sys.argv[0]. Also, PREFIX_DIR -> VAR_DIR.
Also,
* Since the overwhelmingly predominant use of ILanguageManager is to get the description, and since .get_language_data(code)[0] is not very readable, split the interface into .get_description() and .get_charset(). * In the setup, automatically add all Mailman.bin modules as command line scripts.