Quantify localization precision when applying real-time calibration.

[danasimard]

• Using voltages on continuum sources.
• Much of this work has been already done, and described in #66; however this must be repeated after antenna pointing corrections have been made.
• Verification that the conclusions made with continuum sources also apply to pulsed sources should be done with pulsar observations.
• Also related to #52

[danasimard]

Two further things to investigate:

• the effects of using beamformer weights created from passes at a different declination than the candidate
• position uncertainty of calibrators in the nvss catalog currently used to find calibrators