#9411: allow selecting an encoding for configparser files.  Also adds a new test config file to test special cases.

#6538: fix regex documentation again -- use fictional class names "regex" and "match" but do not document them as classes, remove 1.5 compat info and use new default argument syntax where possible.

#1682942: add some ConfigParser features: alternate delimiters, alternate comments, empty lines in values.  Also enhance the docs with more examples and mention SafeConfigParser before ConfigParser.  Patch by Lukas Langa, review by myself, Eric and Ezio.

the first object in the pickle file.

And fix the email package to encode to ASCII instead of ``raw-unicode-escape`` before ASCII-to-binary decoding.

been increased from 100 to 500 and the cache replacement policy has changed
from simply clearing the entire cache on overflow to randomly forgetting 20%
of the existing cached compiled regular expressions.  This is a performance
win for applications that use a lot of regular expressions and limits the
impact of the performance hit anytime the cache is exceeded.