Move some 'roff macros from Guidebook.mn to new file tmac.nh.
Header for tmac.nh is not being updated, even after explicitly adding
it to .gitattributes. I'm not sure what I've done wrong. (I'm using
'git nhadd doc/' here rather than explicit 'git nhadd doc/tmac.nh'.)
In Guidebook.mn, change the ``setenv NETHACKOPTIONS'' example so that
it fits within one line in Guidebook.txt. (I looked at 3.4.3's
edition of that file and the example went not just beyond the margin
of the formatted text but beyond 80 columns, so wrapped in an ugly
fashion.) I had previously changed 'autoquiver' to 'color' to shorten
it, now have changed '!autopickup' to '!leg' to show an example of
truncated option name as well as shorten, and also 'fruit:papaya' to
'fruit:lime' to squeeze out the last two columns needed to fit within
the text margin while retaining 'name:Blue Meanie' as requested.
Guidebook.txt shows both NETHACKOPTIONS examples with indentation
suppressed, Guidebook.ps uses normal indentation (evidently using a
narrower font, even with \f(CR (constant-width Roman) to approximate
TeX's \tt, since the indented example fits fine and looks better).
Some Guidebook.tex catchup. I suspect that lots of bits and bobs
don't match between Guidebook.mn and Guidebook.tex these days.
Particularly quoting and variant font (italics, bold, \tt) usage.
Also the recently added box around the sample screenshot. This
modifies the screenshot to match Guidebook.mn's, reflecting change
in status field spacing by STATUS_HILITES.
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