Push single-shot density plots into filter.

--CAR and HP
WARNING API Change: refactor InternalRate into triggerInterval

to match APS API and GUI.

--CAR
Allow real/imag analysis in pulse calibration.

--BRJ
Updating sequences.

--BRJ and HP
ExpSettingsGUI launcher

--CAR
Merge branch 'develop' of github.com:BBN-Q/Qlab into develop