Patch against Mailman 2.1.5 release fixes bug #913397

[edentz]

Patch against 2.1.5 release to fix bug #913397
<https://sourceforge.net/tracker/index.php?
func=detail&aid=913397&group_id=103&atid=100103>

This hasn't been tested extensively and it may break other
functionality, but it seems to produce the desired result of allowing
user to change the case of the localpart of his/her email address
when checking the "change globally" option on the options page.

[edentz (edentz-users)]

The file MailList.py.diff was added: None

[tkikuchi (tkikuchi-users)]

Logged In: YES
user_id=67709

merged in CVS MailList.py revision: 2.100.2.23