Add ENABLE_A3 configure option to turn on reporting of anomalies to
the A3 host controller.

Fix separation of argv vs. envp in the start process call setup. Also,
no longer send a final extra '\n' argument that was the result of using
fgets and strtok.

Re-commit fixes I made last time that got overwritten by Prashanth's
last commit (mostly lint, maybe a memory leak).

Attempt to be more consistent about which messages go to stdout vs stderr.
Anything that says "ERROR:" now goes to stderr. Pretty much anything else
goes to stdout.

Still more cleanup.