* allow matching process by name (useful for processes changing it)
* check if first argument is executable
* fix function name used in error messages
SVN-Revision: 28991
* add service_check function for checking if a process is alive
* add service_signal for sending arbitrary signals to a process
* change service_stop to send a TERM signal first, wait for the process to die and send a KILL signal if it doen't
* have service_kill print a warning on STDERR stating it has been deprecated
SVN-Revision: 28865