Global grid of uniquely identified tiles, 256px x 0.3125m
specs: PDA (default), PD, PA
acini <catid> <file.geojson> generate all Acini tiles intersecting geojson features from cat id
acini <catid> <file.txt> generate all Acini tiles listed in text file
acini <catid> <file.geojson> -spec 'PA' generate all Acini tiles using PA spec