(proced-command, proced-procname-column): Use
make-variable-buffer-local.
(proced-signal-function): Renamed from proced-kill-program. Allow
for elisp symbols and string values representing system calls.
(proced-marker-regexp, proced-success-message): New functions.
(proced): Use defalias. Add autoload cookie.
(proced-unmark-backward, proced-toggle-marks)
(proced-hide-processes): New commands.
(proced-do-mark): Simplify code.
(proced-insert-mark): Use optional arg BACKWARD instead of line number.
(proced-update): Remove sorting.
(proced-send-signal): Display number of processes to operate on.
Allow for system calls or elisp functions to send signals. Check
if signal was send successfully.
