Updated DEMO files.

b2e1f59 Replace LOW_ENDIAN with LITTLE_ENDIAN.
b7c0533 Ignore DEMO3 results in git.
47e26cf Make scripts work without modifying PATH.
4e57368 Reformat and fix typos in README files.
6a0641d Remove invalid models from script.
9d71268 Format scripts to be somewhat legible.
5baaf64 Remove duplicate DEMO files.
c437d1b Exit with correct status when scripts fail.
330e9a6 Make POSIX sh scripts usable.
d74970d Fix several typos in scripts.
65fb9e8 Remove csh shell scripts.