Account deletion now possible

Account deletion has been made possible with this commit.  This is done
using the edit profile screen.  When you click 'Delete Profile' a jquery
dialog will come up asking if you are sure about deleting the account.
If the user selects 'I'm sure!' the account will be permanently deleted.
I also added a message to user profiles that says 'This user has not
posted any messages' if they have not posted any messages.  I also
removed viewing individual messages as being an onclick event for the
message div.