ncvar_getss: Get a subset of a single netcdf variable
In markwh/subsetnc: Tidily Subset NetCDF Data

Note: collapse_degen (from ncdf4::ncvar_get is always FALSE here, in order to allow subsetting of resulting arrays.

1 2	ncvar_getss(nc, varid, indlist = NULL, verbose = FALSE, signedbyte = TRUE, raw_datavals = FALSE, optimize = TRUE)

`nc`	An object of class `ncdf4` (as returned by either function `nc_open` or function `nc_create`), indicating what file to read from.
`varid`	What variable to read the data from. Can be a string with the name of the variable or an object of class `ncvar4` If left unspecified, the function will determine if there is only one variable in the file and, if so, read from that. If left unspecified and there are multiple variables in the file, an error is generated. This argument can also, optionally, specify the name of a dimension (usually the unlimited dimension) in order to read values from a coordinate variable. Note this is not usual practice, because the `ncdim` object already contains all the dimension's values in the field named "vals". However, it can sometimes be faster to turn off this automatic reading of the unlimited dimension's values by using `nc_open(filename, readunlim=FALSE)`, then read the dimension values in later with this function.
`indlist`	As returned by `ncss_indlist()`
`verbose`	If TRUE, then progress information is printed.
`signedbyte`	If TRUE (default), then on-disk byte variables are interpreted as signed. This is in accord with the netCDF standard. If FALSE, then on-disk byte variables are interpreted as unsigned.
`raw_datavals`	If TRUE, then the actual raw data values from the file are returned with no conversion to NA (if equal to the missing value/fill value) or scale/offset applied. Default is FALSE.
`optimize`	optimize call to `ncdf4::ncvar_get`