groff treats '-' (the character you get when you hit the "minus" key on
the keyboard) as "hyphen", not as "minus". Thus it renders incorrectly
in some locales, and line-wraps strangely.
groff treats the two-character sequence "\-" as "minus", and the
four-character sequence "\(hy" as "hyphen".
Details here: https://lists.debian.org/debian-devel/2003/03/msg01481.html
This commit replaces every instance of "-" in our manpages where the
meaning is "minus" with "\-", so it works right.
This fixes many lintian warnings.
we may want to defer this until later, if we are concerned about users
of hal or rtapi outside the emc2 source tree
Signed-off-by: Jeff Epler <jepler@unpythonic.net>
