[Groff] Revised version of the proposed revised START macro for -mom

[James J. Ramsey]

In response to suggestions from Peter Schaffer (author
of the -mom macros), I made the following changes:

1) TITLE_DOCHEADER is now DEFAULT_DOCHEADER.

2) The space after the docheader is adjusted so that
the text should line up on the bottom margin. However,
I used a different algorithm that calculates the
height of the docheader directly and doesn't require
#DOCHEADER_LINES. So far, the result seems identical
to the original algorithm from -mom, and the new
algorithm has the advantage of accounting for things
like graphics and spacing adjustments within the
macros.

I did find that to further modify the START macro to
adjust the line spacing, I had to work around a weird
(mis?)feature of the ALD macro, namely that this

.if <conditional> \{ .ALD <number> \}

and this

.if <conditional> \{\
.   ALD <number> 
.\}

yield very different results!



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startmacrocandidate.mom
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