Committed, again. (Re: improved mh-chart man page)

[Paul Fox]

Dave tactfully pointed out privately that I'd committed the man page
changes to the 1.7 release branch, rather than master.  Sigh.

I've now pushed reverts to 1.7-release, and cherry-picked my 4 commits
onto master.

Sorry for the git-noise.  :-/

paul
=----------------------
paul fox, pgf@foxharp.boston.ma.us (arlington, ma, where it's 39.7 degrees)