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First, the topic is copied together with all posts visible to all
students.

Second, it is now possible to copy to a different course (limited to
the current semester).

Also, "Edit topics" button renamed to "Topics", so that it does not
get confused with "Edit topic".

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

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See merge request !7

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 #34.