Commit Briefs
honour TMPDIR
This makes using amused a bit nicer on termux where /tmp/ can't be written (or doesn't even exists.) amused still uses /tmp/ if TMPDIR is not specified.
fix my email address
used @openbsd.org initially by mistake and got copied around in most files. Since this has nothing to do officially with the OpenBSD project, use my own email address.
fix mandoc formatting of alternations
Cm on|off renders the pipe in bold too, use Cm on Ns | Ns Cm off to disambiguate.