Improve systematic error PCAL line EPICS records calculations
This MR is intended to improve how systematic error line EPICS records are handled. Previously, there was a required number of frequencies that needed to be provided (6) (LINE5 - LINE10). This has now been improved so that the user can specify which frequency is associated with which LINEx
or (by default) the method assumes that the order provided is the order of LINE5 - LINE10.
Closes #200 (closed) #203 (closed)