Support reading and writing TCS threshold. Added checkbox to short CE/RE for 2-electrode mode. Finishes #6.

Fix zmq.error import error

See merge request !1

ZMQ: Temporary fix to microdrop code to prevent state from resetting until I can figure out why it's listening in the send state.

Fixes #2. OCP experiment saved separately to not overwrite last experiment to make data saving possible.

Implemented version checking and setting of correct gain options in UI (still need to change in experiment to get correct plots)