V 2.2.0 - better tubs, opencv, bug fixes (#173)

* clean up how groups of tubs are handled by adding a TubGroup class (#172)

* Extra steps for Mac installation of simulator

* clean up how groups of tubs are handled by adding a TubGroup class

* hot fix to prevent pi from failing to load socketio

* clean up how groups of tubs are handled by adding a TubGroup class

* fixed split paths for multiple tub groups

* made merging dataframes faster

* made merging dataframes faster

* refactor parts

* merge refactor branch

* name changes

* updated some of the commands (tubcheck, tubhist)

* cleaned up commands

* remove extra code, add tests

* add tests

* update docs

* remove old menu buttons

* remove old menu buttons

* update tests on pi