Comment 0 for bug 266570

This patch adds a Handler that scans each message for
MIME content, removing those sections whose mime types
match one of a list of regexps. multipart/alternative
sections are replaced by the first non-empty
component, and multipart/mixed sections that wrap only
single sections after other processing are replaced by
their contents.
This is a patch against 2.1alpha4.

[http://sourceforge.net/tracker/index.php?func=detail&aid=501199&group_id=103&atid=300103]