Require time-date.

Require time-date.
(proced-command-alist, proced-command, proced-goal-header-re)
(proced-sorting-schemes-alist, proced-sorting-scheme)
(proced-header-alist, proced-sorting-schemes-re)
(proced-skip-regexp, proced-next-line, proced-previous-line)
(proced-listing-type, proced-sorting-scheme-p): Removed.
(proced-grammar-alist, proced-custom-attributes)
(proced-format-alist, proced-format, proced-filter-alist)
(proced-filter, proced-sort, proced-goal-attribute)
(proced-timer-interval, proced-timer-flag, proced-timer)
(proced-process-alist, proced-sort-internal, proced-process-tree)
(proced-header-help-echo, proced-field-help-echo): New variables.
(proced-pid-at-point, proced-timer, proced-mark-process-alist)
(proced-omit-process, proced-filter, proced-process-tree)
(proced-filter-children, proced-children-pids)
(proced-filter-parents, proced-<, proced-string-lessp)
(proced-time-lessp, proced-xor, proced-sort-p)
(proced-format-time, proced-format-start, proced-format-ttname)
(proced-format, proced-process-attributes): New functions.
(proced-toggle-timer-flag, proced-mark-children)
(proced-mark-parents, proced-filter-interactive)
(proced-filter-attribute, proced-sort-interactive)
(proced-sort-header, proced-format-interactive): New commands.
(proced-move-to-goal-column): Use goal-column.
(proced-mode): Use proced-timer.
(proced-do-mark-all): Display process count.  Use use-region-p.
Simplify.
(proced-omit-processes): Use use-region-p.
(proced-sort-pcpu, proced-sort-pmem, proced-sort-pid)
(proced-sort-start, proced-sort-time, proced-sort-user): Use
proced-sort-interactive.
(proced-sort): Make it a function that performs the actual sort.
(proced-update): New arg revert.  Use proced-process-alist,
proced-filter, proced-sort, proced-format, and
proced-grammar-alist.  Preserve position of point based on fields.
Make header line and fields clickable.
(proced-send-signal): Use proced-pid-at-point and
proced-process-alist.
(proced-why): Use save-selected-window.
(proced-log): Use buffer-read-only.