Allow upload of tfw with tif upload

[jj0hns0n]

Currently a geotiff upload requires that the geospatial metadata is included inside the geotiff itself, but it is quite common for geotiffs to be distributed with the geospatial metadata in an auxiliary tfw file.

The upload functionality in GeoNode should be extended to accept a tif+tfw upload and either use this directly, or convert it into a proper geotiff at runtime.

[drwelby]

Gs_config is already set up to handle tfw files, and with a little modification could handle other raster types. I was able to modify Geonode's uploaded and bundler to upload the tif and tfw to Geoserver which accepts it and overall can be made to work. Might have some ugly edge cases.

[ingenieroariel]

Adding this to the 2.0 milestone as as it is an easy fix to a usual problem with tif files. Definitely not a blocker but closer to a bug than an enhancement.

[jj0hns0n]

Punting to 2.1

[ingenieroariel]

Should be addressed as part of the Upload/Download GNIP #1421

[ingenieroariel]

It could be added to the geoserver importer.