🚀 go-pugleaf

I've received a couple hundred responses by now - thanks to each of
you for your two cents!  I'm going to the Bahamas tomorrow. :-) I
would like to stop the deluge of messages, so please don't send me any
more poll responses.

If you're curious:

The vast majority agreed that the mode line percentage should show the
position of the last line of the window in the buffer.

A significant minority suggested that we add another specifier that
displays the bottom line's position; people could then use the
existing and new specs together to get things like "%33 - %66"
(viewing the middle third of the file).

Two or three collusive eccentrics :-) suggested a scroll-bar type
indicator which would show things like "[--####]" (viewing the last
two thirds of the file).  I think this is clever, but it feels a bit
glitzy to be a primitive; maybe this can wait until we have specs that
run arbitrary lisp code.

A clever soul pointed out that bottom-line and top-line percentages
are symmetrical (except for the fact that the mode line is at the
bottom of the window), and thus share benefits and drawbacks.  The
same person (I think) also observed that people usually read files
forwards, not backwards.

So the significant decision is now: add a new specifier, or change the
old one?  The bottom-of-window percentage makes sense and is popular,
and defense of the top-of-window percentage has been quite weak
(mostly in the name of generality and familiarity).

That makes me think that the top-of-window percentage was probably not
quite the right feature all along, and is not a very interesting
alternative.  I am going to change the existing spec to show the
bottom-of-window percentage.