scripts/check-system-configuration.sh:  ignore comments

Reported by seb_kuzminsky

Fix the awk filter to ignore comment lines.

Fixes #90
scripts/check-system-configuration.sh:  output tweak

Reported by seb_kuzminsky

Don't run shmdrv check if no kthreads flavors were built

Fixes #90
tests/module-loading:  Print debug output on failure

Recent intermittent test failures in tests/module-loading/*, but no
debug output.

Print contents of output files to give us a clue.

Fixes #89
tests/bitops.0/test.sh:  change include dir to /include from /src/rtapi

Theory:  tests ought not to depend on anything in /src/
configure.in:  ensure /bin and /usr/bin are in $PATH

Yes, /bin was actually missing from $PATH in a Wheezy debootstrap
chroot environment.
debian/control.in:  Build-Depends: kmod, procps

If ./configure doesn't find lsmod, ps and kill, the realtime and
linuxcnc scripts will break with empty $LSMOD, $PS and $KILL
variables.
FIXME:  temp. don't kill realtime.in to debug a msgd hang

Instead get a gdb back trace and then hang forever.