Absolute sensor threshold works like usual
Scaled sensor threshold only applies for DARM above threshold and will only demote measured value to upper limit if not exceeded in sensor

Added injection type as required positional arg to pemcoupling
Use broadband, comb, and line and injection types instead of vibrational vs magnetic
Renamed local_max_window --> peak_search_window
Renamed PEMChannel --> Sensor
Created SensorTS class and renamed PEMChannelASD --> SensorASD
Tidied up composite and summary plot code
Modified variables and config parsing to match new config file format

New calibration/channel list format and many changes to composite and summary coupling functions

See merge request philippe.nguyen/pemcoupling!1