Move parts of webservices.py to waterboards.py

[bdestombe]

          Ah I understand. I should have put the logic for waterboards in waterboards.py and not in webservices.py. I don't remember why I did that. I can fix this, but unfortunately not anytime soon. For now we can merge this as a quick fix and leave an issue open for me to fix this correctly later.

Originally posted by @OnnoEbbens in #314 (comment)

[OnnoEbbens]

fixed in the dev branch