Assume filename contains full path

Change image ingestion so that it assumes the
image filename in the json file contains the
full directory path.

Previously, the filename was assumed to be
relative to the "input_dir" (where the json
files are) which made is less flexible. Now
the image files could be located anywhere.
Merge branch 'add_images'

Merge in the change to include full
directory path in image filenames
Merge branch 'master' into cloudscreening