Standardize indentation in login.html
Convert much of login page positioning to relative values

A little more flexible for screen sizes. Login box width is still
vexing.
Make TOTP login optional

Hide the TOTP web login form if TOTP web login is disabled
Merge pull request #315 from dsnellgrove/totplogin

Totplogin
Merge remote-tracking branch 'crits/master' into Dashboard_2.1