calpuff_06_complex_terrain_inputs: Set the CALPUFF subgrid scale complex terrain inputs
In rich-iannone/PuffR: A set of tools to help with CALPUFF dispersion modelling.

This function validates and writes CALPUFF subgrid scale complex terrain inputs.

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calpuff_06_complex_terrain_inputs(calpuff_inp = "calpuff_template.txt",
  nhill = 0, nctrec = 0, mhill = 2, xhill2m = 1, zhill2m = 1,
  xctdmkm = 0, yctdmkm = 0)

`calpuff_inp`	the absolute path and filename for the working CALPUFF input file.
`nhill`	the number of terrain features.
`nctrec`	the number of special complex terrain receptors.
`mhill`	provenance of terrain and CTSG Receptor data: (1) hill and receptor data created by CTDM processors and read from HILL.DAT and HILLRCT.DAT files, or (2) hill data created by OPTHILL.
`xhill2m`	factor to convert horizontal dimensions to meters.
`zhill2m`	factor to convert vertical dimensions to meters.
`xctdmkm`	the x-origin of the CTDM system relative to the CALPUFF coordinate system, in kilometers.
`yctdmkm`	the y-origin of the CTDM system relative to the CALPUFF coordinate system, in kilometers.