restrict: Extract data from netcdf file based on land id
In cszang/squadron: Extract data from land id netcdf files

(Relatively) fast way to extract data from netcdf file structured by land id. The use case is to extract a subset of the full grid, based on a set of land ids. These can be non-consecutive.

1	restrict(f, var_id, var_land_id = "land_id", ids, par = FALSE)

`f`	the path to the netcdf
`var_id`	variable to extract
`var_land_id`	variable used for land ids in the netcdf file
`ids`	a vector of land ids
`par`	run in parallel mode (not implemented)