get_maxar_ensemble: Subfunction to load in ECMWF data
In kdayday/ppnwp: Post-Process Numerical Weather Prediction ensembles

Loads in ensemble forecast data into the form: [issue x step x member] If input file is in Maxar form, assumes a NETCDF file of the dimensions: [Day x Hour x Site x Lead time x member] Maxar data can be loaded to either match the form above or in a "rolling" format over the course of the year in the form [1 x all steps x member] to make annual average metrics easier

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get_maxar_ensemble(nc, members, site, metadata, ensemble_issue_times,
  vname = "powernew", truncate = T,
  date_data_start = lubridate::ymd(20160101), max_power = NULL)

`nc`	An open NetCDF object
`members`	A vector of member indices
`site`	Site index
`metadata`	Metadata list including date end, temporal parameters, time-steps per day, rolling or not, etc.
`ensemble_issue_times`	A sequence of lubridate issue times
`vname`	NetCDF variable name
`truncate`	Boolean: Whether or not to truncate the forecasts at the site maximum power
`date_data_start`	A lubridate: Date of first day in file
`max_power`	AC power rating or maximum load power