Fix a few bugs on the move

Resolve "Implement join call in handle_from_data"

Closes #22

See merge request !10

Resolve "Handle API calls from Python data structures"

Closes #21

See merge request !9

Also, fix it while at it ;).

Reorganise how tests are called on the way; accidentally add some
caching and intelligent meeting search

Resolve "API loadbalancing"

Closes #9

See merge request !8