Move mock and test out of top level #45
Description
Diffcalc exposes both mock and test at the top level, both of which could cause issues when trying to use diffcalc within a large codebase.
In particular this has caused an issue in GDA where doing import mock from other Jython files uses the diffcalc version rather than the mock package we have installed in site-packages.
For the mock package can we just list it as a dependency in the setup.py and remove it from the codebase entirely?