r.in.ahn: changed how AHN is downloaded and added various download options #1565
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The module now downloads tiles directly from the AHN object-storage service. The earlier WCS-based download method and the option to retrieve the complete map sheets intersecting with the computation region are no longer supported.
Added the options to download AHN versions 2 to 6 (was version 4 only).
Added the option to download the maps at 0.5 or 5 meter resolution.
Added the option to compute the canopy height model (CHM). With this option, both the DSM and DTM are downloaded and imported. A third map, the CHM, is calculated as DSM - DTM.
The user can set nprocs. When nprocs > 2, downloading and importing of tiles will be done in parallel, and it will be set for r.patch. When a MASK is present, this will be temporarily disabled using MaskManager (grass version 8.5) or by temporarily renaming the MASK layer (grass version 8.4).
Add option to download lidar data tiles. In this case, they will be downloaded and a list of files is created. The data will not be imported (too many ways and options to import the data).