scanbd Code

Corrected debug/ debu_level handling:
- When set from commandline it overrides theconfig file
- When SIGHUP is received we only use the config file unconditionally

added explicit cast (NetBSD)

changed scanbuttond backends dir consistently to /usr/local/lib/...

moved cfg_do_parse() after reading option values, because option -c sets config-filename. Added logic not to overwrite debug option

Added GNU header to FreeBSD.rc
Added description for saned.fdi

- added the logic to determine the absolute/relative script-path to scanbutton_wrapper.c (from sane.c)
- added checks for numerical commandline-options

Updated doc/README.txt with difference between scanbd/ scanbm.
Reflect that -c is normally needed
Formatted for line lenght 80 chars

- Added a FreeBSD startup script for scanbd
- Added a README in the integration directory with explantion of
what most files are for
- Updated systemd unit files
- Fixed Makefile.am to properly include scanbuttond/include files

Fixed a case where, if scriptdir is not set, the script path does
contain ///. FreeBSD libc does not like that

Added scanbm.man