[Groff] Naming and position of *.man in the groff sources

[Bernd Warken]

1) There are many man-page in the groff sources distributed all over the
./src tree.  I propose to move all of these into a single directory,
either ./doc or ./doc/man - except for the ./contrib files.

2) The man-page source files are actually named
          <name>.man
and then make'd into
          <name>.<section>.
But now there are man-page with the same name from different sections,
e.g. groff(1) and groff(7).  A possible solution to this problem would
be to rename the man source files to
          <name>.<section>.man.

Bernd Warken <address@hidden>