Create Method for Sensing Function to Model DAC-driven Electronics Measurement and Process Measurements

The new DCPD electronics chain comes with a handy test path when we can measure a large collection of sensing function electronics.

The components of the measurement, are described conceptually in Part IV of G2200551

The nominal calibration of the measurement is described in the "%%% Verification of compensation via remote transfer function %%%" half of LHO:62653.

It seems like we'll be taking this measurement a lot to confirm the absence of time dependence and non-linearity, it'd be sweet if there was a pyDARM method to create this transfer function.

Part and parcel with that request would be a measurement processing method that grabs the data from DTT template and compares it (takes the ratio) against the above mentioned model.