<Someone>'s submittal of his `showrun' option has goaded
me to finally finish something I tried to implement some time back.
This adds a new run-time option called "runmode" which gives the
user control over how much screen udpating takes place during run
and travel movement. It has four settings:
teleport - update the map after movement has finished (this is
the old behavior and also <Someone>'s !showrun behavior);
run - update the map periodically (this is the new default);
it uses (`moves' mod 7) to control the updating; it may
need to have its own counter so that the updates are
sync'd with the start of current movement rather than
with `moves', but perhaps that won't matter;
walk - update the map after each step (this is the behavior
when <Someone>'s showrun is enabled);
crawl - like walk, but with a longer delay after each step.
This option won't work well on configurations where delay_output()
doesn't produce a pause of reasonable duration, but I don't think
there's much we can do about that.
The option setting ought to be stored in struct flags so that
it's maintained across save/restore cycles, but I put it into the
iflags structure with the other new options so that it won't cause
3.4.0 save files to be invalidated.
I can't test the changes to Guidebook.mn; the corresponding
changes to Guidebook.tex process ok and don't show any obvious
glitches when viewed with xdvi.
c5540f4687