remove extra punctuation; from alexander arch

.Li -> .Vt where appropriate;
from josiah frentsos, tweaked by schwarze

ok schwarze

fix maths error; from xordspar
ok ratchov

fix NAME; ok schwarze

Use "In" to mark up include files, instead of wrongly wrapping with Aq.

Aq is not the same as <> in non-ASCII situations, so this caused
incorrect output in some places. And it provided no semantics

Use "In" to mark up include files, instead of wrongly wrapping with Aq.

Aq is not the same as <> in non-ASCII situations, so this caused
incorrect output in some places. And it provided no semantics besides.

ok schwarze@

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use .Mt for email addresses; from Jan Stary <hans at stare dot cz>; ok jmc@

make -column lists pretty again;

specifically, rewrite them to permit some markup in the column headers,
and use "Ta" instead of literal tabs; mandoc does not currently match groff
100%, but a mando

make -column lists pretty again;

specifically, rewrite them to permit some markup in the column headers,
and use "Ta" instead of literal tabs; mandoc does not currently match groff
100%, but a mandoc fix may be some time off, and we've gone enough releases
with poorly formatting column lists.

in some cases i have rewritten the lists as -tag, where -column made
little sense.

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.Bl always requires .It, even in .Bl -column;
syntax errors found by mandoc(1), also required to fix the mandoc build;
feedback and ok jmc@ and sobrado@

s/hz/Hz/ on multiples of the SI unit hertz other than MHz.

reminded by STeve Andre.

convert to new .Dd format;

20005 is a bit ambitious, but then this was committed on a friday 13th...

Move speaker(4) to MI land.