WARNING API Change: refactor InternalRate into triggerInterval
WARNING API Change: refactor InternalRate into triggerInterval

to match APS API and GUI.

--CAR

rmcgurrin/Qlab,BBN-Q/Qlab,rmcgurrin/Qlab,BBN-Q/Qlab,BBN-Q/Qlab,Plourde-Research-Lab/Qlab,rmcgurrin/Qlab,BBN-Q/Qlab,Plourde-Research-Lab/Qlab,Plourde-Research-Lab/Qlab,rmcgurrin/Qlab