Updated backends with EXTRA_* files to allow Makefile's
to always pass in BACKEND_NAME to be fixed to backend name
instead of filename; while still making sure that
SANE_DEBUG_${BACKEND}* exist as documented in man pages.
Add references to epson and epson2 man pages about
SANE_DEBUG_EPSONx_SCSI and _NET options.
Created an epson2 man page; based mostly on epson page.
ADF in simplex mode (used some code from the EPSON Kowa IScan version
of the backend)
* backend/epson_scsi.c: Use sanei_scsi_cmd2() to send commands to fix a problem
with SBP-2 under FreeBSD
Chris Bagwell