Renumber termination tests so they're last.

e.g. "jsexec popen.js 'echo test1234'"

thread tell the echo thread to exit.

load()ed file, not argc

It fails.

are objects.

Sysops are not normally expected to run these.
- while1.js (infinite loop detection testing)
- recurse.js (infinite recursion detection testing)

For use only by go-getters who understand the psychology of these things.