Range violation when deleting a user.

DeleteUser should be using params["user"] instead of form["user"].
Merge pull request #7 from MikeWey/deleteUser

Range violation when deleting a user.
Improve error messages.
Avoid use of deprecated/removed symbols.
Show the (deleted) message count for each user to ease detection of spammers.
Add quick access to ban or unban a user in the admin panel.
Implement a simple bayes spam filter.
Decode subject header.
Decode subject header also for group overview.
Sanitize headers for UTF-8 charset and also use decoded subject lines for thread subjects.
Change Bayes filter to a naive one.
Improve styling of the admin article listing.
Change final probability calculation to avoid double precision issues and add a small bias to avoid 100% spam probabilities.
Use the "antispam" package instead of the built-in spam filters.
Fix compilation for latest vibe.d.
Avoid initialization in unittest builds.
Fix spam detection code and unify spam handling for the web and news interfaces.
Change license to AGPL-3.0 instead of GPL.
Add additional check to make sure a "Date" header exists and fix messages without one on start up.
Use the right object ID when correcting missing Date headers.