* backend/umax.c, bachend/umax-scanner.c, backend/umax.desc,
doc/umax/sane-umax-config-doc.html, doc/umax/umax.CHANGES,
doc/sane-umax.man:
update to sane-umax-1.0 build 30:
- added EDGE KTX-9600US as supported scanner
- Changing scansource does not change lower left selection
edge if not necessary