Improve login form.

Much has to be done yet, but it is a start... Have to
figure out why

    .login_form header {background-color: #D0D0D0;}

did not work (placed it inline for now). Also, in case
of login failed, a red message is show with the help of
the helpers.php file/functions. That one also needs some
adjustments, and position the message a little better.