Added filtering to remove possibility of executing commands by tricky use of the post variables. All non alpha-numeric characters are now removed from usernames and/or passwords when adding or modifying users.
Slightly improved layout of messages.

git-svn-id: file:///Users/Shitiz/Downloads/lssvn/trunk/unstable@757 b72ed6b6-b9f8-46b5-92b4-906544132732