Add graphical password meter again.
Remove texts describing password inadequacies.

Texts were a bit jittery, and probably would not have helped
ordinary users that much. We have a graphical password strength
meter instead now.
Properly remove all spaces from password.

Two problems existed with previous implementation:

.replace(a, b) only replaces first occurance.
pwcheck would apply zxcvbn _without_ removing the spaces.
downgrade entropy with 'eduid' in passwords
eduiddashboard.db is no more