manaus_clump writes intermediate forest files to directory and doesn't remove them at end of process
started editing of construct terrageny code
moved functions to function directory
Moved dataset specific vars to top
in process of rewriting to work with raster package (for massive speed improvements)
terra.1 now appears to construct correctly, using raster package functions.
adding script to make files for terrageny unit test

constructTerr now appears to work correctly
Added some warning messages
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