Fix spelling and encoding errors in manpages and an error message
prompter: Various rework. Removed -kill and -erase as they are not needed anymore today. Removed -doteof/-nodoteof. -nodoteof had been the default already. Made the yet hidden switches -body/-nobody visible, but with a slightly different meaning. See recent changes in the man page prompter(1) for details. (Eventually, one can have mutt-like message composing.)
Man pages: Replaced \*(lq and \*(rq with ` and '. Using the quotes directly is staight-forward and convenient to read and write.
Renamed -version switch to -Version to remove the conflict with -verbose. Now, `mhlist -V' prints the version and `mhlist -v' lists verbosely. There are only a few switches left that conflict on the first character, apart from the inverted (no*) variants.
Automated generation of mh-chart.man7. Moved mh-chart from section 1 to section 7, in the same go. Based upon a pull-in from nmh. Thanks a lot to David Levine. Autogenerating is the only sensible approach to mh-chart.
Reworked the man page system and some man page contents (mmh-intro). Now it's possible to have two equally named pages in two different sections. This appeared to be interesting for mmh(X), but I don't use it now. Let's see if we keep the new system or even rework it to become simpler.