get_load_telemetry: Load data from a NETCDF file of telemetry
In kdayday/ppnwp: Post-Process Numerical Weather Prediction ensembles

Assumed file dimensions: Day x Hour x Zone Time-point selection is a consecutive sequence

1 2	get_load_telemetry(nc, site, metadata, date_start, date_data_start = lubridate::ymd(20160101), vname = "hsl_power")

`nc`	Open NetCDF file
`metadata`	Metadata list including date end, temporal parameters, time-steps per day, rolling or not, etc.
`date_start`	A lubridate: Start date of data to load
`date_data_start`	A lubridate: Date of first day in file
`vname`	NetCDF variable name
`zone`	Zone index