Add option to standardize case of user names coming from CAS

[anonymous]

In our environment, CAS is not case-sensitive. It will allow you to log in with lower case or upper case letters, and the user id is returned to Trac in the case it was entered. Trac is seeing this as two different users. It would be cool if the Plugin would convert the user id to all upper or all lower case letters to avoid this problem, before returning it to Trac. I know almost nothing about Python, so to make this correction myself has proven problematic. A little help would be great, and I think others would have this issue too.

[Noah Kantrowitz]

This is already taken care of by the ignore_auth_case option in trac.ini. The CAS plugin will respect it in the same way as the normal login module.