style message about missing blank before trailing delimiter;
inspired by mdoclint(1), and jmc@ considers it useful

Now that markdown output is tested for almost everything, test all
input files in -T markdown output mode by default and only mark
those files with SKIP_MARKDOWN that are not to be tested.
Much easie

Now that markdown output is tested for almost everything, test all
input files in -T markdown output mode by default and only mark
those files with SKIP_MARKDOWN that are not to be tested.
Much easier to read, and almost minus 40 lines of Makefile code.

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implement .An -split and -nosplit

first batch of -T markdown tests

Let .Ao and .Aq render as "<>" after .An and as "\(la\(ra" elsewhere,
just like groff; minibug noticed by bentley@.

test some simple macros; written while working on -Tman