Hopefully Closes #79

See #78

See #78

This way, when the user has vi or less etc. open (which breaks verification), the user at least gets some indication on the API that something happens.

Furthermore, after 5 seconds, they will be offered to restart the exercise, which is better than just doing nothing without comment

Previous entries contain commands executed by the user, so they obviously won't contain the system-executed verification command. That is not an issue.

Closes #56

Closes #58

Until it is ready.

Closes #69

Closes #76