Align to the new, sane behaviour of the groff_mdoc(7) .Dd macro:
without an argument, use the empty string, and always concatenate
all arguments, no matter their number.
This allows reducing the numb

Align to the new, sane behaviour of the groff_mdoc(7) .Dd macro:
without an argument, use the empty string, and always concatenate
all arguments, no matter their number.
This allows reducing the number of arguments of mandoc_normdate()
and some other simplifications, at the same time polishing some
error messages by adding the name of the macro in question.

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Messages of the -Wbase level now print STYLE:. Since this
causes horrible churn anyway, profit of the opportunity to stop
excessive testing, such that this is hopefully the last instance
of such chu

Messages of the -Wbase level now print STYLE:. Since this
causes horrible churn anyway, profit of the opportunity to stop
excessive testing, such that this is hopefully the last instance
of such churn. Consistently use OpenBSD RCS tags, blank .Os,
blank fourth .TH argument, and Mdocdate like everywhere else.
Use -Ios=OpenBSD for platform-independent predictable output.

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cope with changes in BASE messages

churn related to the new style message about RCS ids

churn caused by the new Mdocdate messages, no easy way to avoid this :(

new regression tests collected during recent work