Add built-in type "self" and option to preface -delay samples w/time

As always, git log -p has full details, but as a summary:

- Fix `schedStat` spelling (hitherto undetected since `styleCheck=usages styleCheck=error` does not work unless `hint[Name]=on` is also set).

- Add option to preface each sample in differential-delay mode with time.

- Add a built-in type "self" for the procs display process itself. This can be nice either to suppress it, say in
    `procs display --delay=0.001 --excl=self`
or to emphasize it (e.g. to know which tty ran program in tree formats) with special colorization.

- Update example color config, correctly renumbering side-comment slots and default to struck (& probably bold, unlike zombies).