introduce narrowband radiated freq
extend schema to allow for narrowband noise
evolving scnearios
allow Sensor2 data recording
allow storage & retrieval of freq attribute
initial steps for recording frequ data
use correct speed conversion
introduce doppler calcs
Merge pull request #716 from debrief/feature/ian/radiated_freq

Introduce vessels with narrowband signature, initial steps for doppler freq calculations
Merge branch 'master' into feature/ian/forecast_range