This commit adds support for (slide) scanners based
on Pacific Image Electronics (PIE) oem scan hardware.
It is known to match the following USB scanners
PIE PowerSlide 3600 Untested
PIE PowerSlide 3650 Untested
PIE PowerSlide 4000 Untested
PIE PowerSlide 5000 Untested
Reflecta CrystalScan 7200 Untested
Reflecta ProScan 7200 Untested
Reflecta DigitDia 4000 Untested
Reflecta DigitDia 5000 Untested
Reflecta DigitDia 6000 Ok
The backend is based on work by Jan Vleeshouwers and Michael Rickmann.
Special thanks to Stéphane Voltz for the code review.
Add pieusb to backend/Makefile.am
Add pieusb to doc/Makefile.am
Add missing sanei/sanei_ir.c, sanei/sanei_ir.h, adapt Makefile.am
configure.ac: Add 'pieusb' to ALL_BACKENDS
ChangeLog: Add pieusb as new backend
Mark infrared functions as internal: sane_ir_* -> sanei_ir_*
sanei/sanei_ir.c: fix memory leaks
pieusb: rename cmdGetMode and cmdSetScanHead
... to their sanei_pieusb_cmd_... equivalent
pieusb: rename definition_list_head to pieusb_definition_list_head
Add pieusb to AUTHORS
pieusb: copyright 2012-2015
pieusb: don't include sanei_thread.h
Peter Marschall