process_tiffs integration in postprocessor workflow

[Fergui]

Incorporate the processing of GeoTIFF output files in the general postprocessor workflow. That will require:

• Generalize GeoDriver to process multi-band Geotiffs:
  • [x] GeoDriver.from_elements to allow multi-band arrays (3d).
  • [x] GeoDriver.to_geotiff to allow multi-band arrays (3d).
  • [x] GeoDriver.resample_bbox to allow multi-band arrays (3d).
• [x] Incorporate ncwrfmeta in src/geo/geo_utils.py to generate CRS, and atmospheric and fire geotransforms from NetCDF file.
• Incorporate functionality in src/process_tiffs.py into src/vis/postprocessor.py using src/geo/geodriver.py:
  • [x] Generate CRS and geotransform in process_vars using ncwrfmeta.
  • [x] Incorporate GeoDriver.from_elements().to_geotiff() into _scalar2raster and _vector2raster.
  • [x] Generate arguments in previous functions to specify CRS and geotransform.
  • [x] Connect arguments from process_vars -> _scalar2kmz -> _scalar2png -> _scalar2raster and process_vars -> _vector2kmz -> _vector2png -> _vector2raster
• Create functionality to process GeoTIFF files in src/forecast.py:
  • [x] Incorporate tif_proc flag to turn GeoTIFF processing on with default off (it is expensive in terms of memory usage).
  • [x] Specify the flag using job.json file.
• [x] Test that the GeoTIFF processing is done correctly.

[Fergui]

The commits included are 74cbb26713bcadfa4ace855a82129ecc8ee55d2e, 1896b39dfe959efc806cf69d28d18fd23f4fbc36, 633618c52f4c0faf7e269ac82a75578777b9df2b, and closed in b73793d6399177d7afb7f79ed6ab2a63830cf89d.