Merge the last bits of 1.10.6 (released today), most were already in:

* ignore double-.Pp
* ignore .Pp before .Bd and .Bl (unless -compact in specified)
* avoid double blank line upon .Pp, .br and friends in literal context
* cast enums to int when passing them to exit(3) to please lint(1)
While merging, fix a regression introduced by kristaps@:
Outside literal mode, double blank lines must both be printed.
To achieve this again after kristaps@ improvements in 1.10.6,
treat such blank lines as .sp (instead of .Pp as in 1.10.5)
and drop .Pp before .sp just like dropping .Pp before .Pp.

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