mandoc and EOS spacing.

[Kristaps Dzonsons <kristaps@bsd.lv>]

Hello,

I just checked in a framework for EOS spacing in mandoc.  It's a very 
small, easily-auditable patch, but it works quite well and can expand to 
handle lots of hard cases.

It works by the back-ends setting a flag for nodes are on a sentence 
boundary.  The front-end drivers catch this and (optionally) sets a flag 
for the output engine, which adds an extra space to the inter-word spacing.

I've implemented it for non-literal free-form text contexts in both 
-mdoc and -man for -Tascii.  It's documented in mdoc.7 and man.7, 
respectively, both of which have also been end-of-sentence-end-of-lined.

Thanks,

Kristaps
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