Change some "nmh" into "mmh" in man pages This is to avoid confusion between nmh and mmh
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.
Moved conflict, rcv*, slocal, spost from libdir to bindir. We should not hide them from the users.
Removed rcvtty. Its use cases disappeared over time. And as asyncron notifications rip you out of your working flow, you usually don't want to have them. If you need this function though, then you can make use of write(1).
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.