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Also refactored CLI a little and made search for courses local
in to current semester.

They could have told...

Closes #38.

This makes things more complicated, but it allows for sorting
order compatible with the rest of the world :)

By mistake, we used TokenLoginForm instead of EnrollTokenForm(),
which worked until we renamed login tokens to access codes :)

We prefer local UK addresses.

Closes #31.

Closes #22.

Closes #25.

For connection to local Postgresql instance using UNIX domain
socket set DB_HOST and DB_PASSWD to None.

Closes #13.

Closes #11.

Closes #19.

Closes #17.

Without that, the real error message can be hidden at the bottom of the page.

Closes #9.

The color of errors was inspired by Bootstrap.