Fix -man -Thtml formatting after .nf (which has nothing to do

with "literal", by the way, it means "no fill"):

* Use <pre> such that whitespace is preserved.
* Preserve lines breaks.
* For font alternating macros, avoid node recursion which required
scary juggling with the fill state.  Instead, simply print the text
children directly.

Missing feature first noticed by kristaps@ in 2011,
the again reported by afresh1@ in 2016,
and finally reported here: https://github.com/Debian/debiman/issues/21 ,
which i only found because of Shane Kerr's comment here:
https://plus.google.com/110314300533310775053/posts/H1eaw9Yskoc

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