Add columns for google auth.
Initial revision.
Make up google auth secret when users sign up.
Prompt for and verify google auth code if 2-factor auth is enabled for the account.
Remember the last OTP that was used, so we don't allow it to be used twice (replay attack).
Don't allow the same OTP to be used twice.
Remove manual padding.
Link user's name in top right to a settings page.
Redirect to 'settings' page.
Add 'settings' to list of pages with tabs.  Make it easier to add more in future.
Put padding above and below tabs.
Remove manual padding.
Remove manual padding.