Updated OS X pid_exists to use kill() instead of iterating process list since this is faster and more elegant (and avoids needing a special case for PID 0).
Updated OS X pid_exists to use kill() instead of iterating process list since
this is faster and more elegant (and avoids needing a special case for PID 0).

ztop/psutil,ztop/psutil,ztop/psutil,ztop/psutil