UC1 compute

[sbillinge]

Problem

need a test for UC1

Proposed solution

write it. Define expected and actual so we get the right API definitions. Maybe we want a module with all the structure representations. We need a name for it. representations.py? then we would have from similarity.representations import amd which seems to make sense. In this file define but make it empty. Something like

def amd(structure):
'''
<write the full docstring>
'''
return

Then in tests create test_represnetations.py and write the test, making use of the fixture in conftest.py