New process_exif script

This script can read a .data file from the logs and insert GPS coords into the EXIF tags from a set of photos. The README file contains instructions on how to set this up. 

Obviously this approach isn't foolproof, when the camera for example skips a picture, but if the operator starts and ends the autoshoot process correctly, the numbers should more or less match up (if the last DC_SHOT is not received, then they won't).

Not sure why these sw/ext/... directories came up. I did a "git checkout -- ..." on those directories prior to the commit, but they didn't want to go away. 

Testing:
- I've tested this with two of my datasets on the southern and western hemisphere. I don't have data for north&east though.