RTI processing workflow

This integrates building image sets from incoming camera images with ptm fitting.
Based on John Cupitt's version of ptmfit, Philip Basford's RTIprocessor and Importer.
Written by Ben Thompson and Kirk Martinez 2020.

You can edit the rti.config file to set the defaults.

After the image imports into folders named basename_0000 etc 
you can set a crop box on the originals by dragging the red lines.
This makes smaller, faster-loading ptms.

To-do:
Package installation better
Allow processing of pre-existing folders
Integrate HSH fitter
Improve completion notification