Iss9

Implementing MD5 hashed passwords for issue #9 .

The URL /login (Global, in Root.pm) expects a username and clear text password.  Obviously, it would be nice if ifcomp.org always ran SSL to offer a fig leaf of protection.  

Two simple pages may be returned.  On success, the user will see a greetings page.  On failure, a FORBIDDEN (this is not a true 403 forbidden page, but one adequate for testing).

I have not designed even a simple login page.  I will do this when I add sessions, I think.

I hope that I have not violated IFCompDB::User.pm again.  I believe my changes are below the checksum.