mergeAnalogsByStations: RAnEnExtra::mergeAnalogsByStations
In Weiming-Hu/RAnEnExtra: Extra functions for RAnEn

RAnEnExtra::mergeAnalogsByStations reads a vector of analog files, usually generated from anen_netcdf or anen_grib, and then combines analogs by stations. It is assumed that analogs, Xs, and Ys exist in all files.

mergeAnalogsByStations(
  files,
  verbose = T,
  merge_forecasts = F,
  cores = 1,
  copy_vars = NULL
)

`files`	A vector of AnEn files
`verbose`	Whether to be verbose
`merge_forecasts`	Whether to merge `Forecasts/Data` if it exists
`cores`	The number of cores to use while reading files
`copy_vars`	The variable names to simply copy from the first file in the (sorted) list into the final AnEn list