Use Amiga background images

[joetsoi]

$ find DISKB -name "*.CMP" -print0 |  du --files0-from - -b -c -s
14933	DISKB/WA1.CMP
19466	DISKB/SWB1.CMP
20932	DISKB/WAB1.CMP
18008	DISKB/SW1.CMP
22872	DISKB/FO1.CMP
25493	DISKB/FOB1.CMP
35331	DISKB/MAP.CMP
20901	DISKB/GLB1.CMP
20809	DISKB/FO2.CMP
198745	total

The amiga versions of these files are helpfully packed together in a file called "test"

$ du -b disk2/test
198745	disk2/test

So we need a configuraiton file containing all of the locations of the different background files inside test and a way of reading them all into Object and Piv files.