Adding Focus/FOV image saving routine

Adding routine to save images for the different sensor/lens
combinations, so that we can assess which is the best FOV/lens/sensor
combination and test some of the best for focus/MTF.
Additionally switching all instances of
apbase.Camera().sensor.name to ...sensor.part_number which gives the
expected name (printed onto each board).
First, very basic version of DevWare RAW reader

This version is able to read unsigned 16 bit raw images from DevWare
and to display them. Tip to the hat to
http://scipy-lectures.github.io/advanced/image_processing/ for reading
the images from disk and not into the memory.

Additionally, white space changes in GDX.ini
Expanding it to read all images in a given dir

Script now reads all images in the given directory and displays them one
after another. Extracting image size, lens and other stuff from the file
name through some string massaging.