hgrc: clean up machine-specific settings handling HGRCPATH ends up overriding machine-wide settings, which isn't what I want. Recent hg is nice enough to silently ignore includes of nonexistent files, so just use %include now.

#!/bin/sh
if [ "`uname`" = "Darwin" ] ; then
    open -a emacs "$@"
else
    emacs -nw "$@"
fi