Add the BULLETIN files from decuslib.

Not all files have been added.  The files still in ZIP, ZOO and LZH
archives are being held back and will be unpacked and added in the
next commit.  In the process of unpacking some of these files will
be overwritten.

Also not added:

  * Executable and generated files: .exe, .obj and .olb.
  * Some of the bulletin directories had xdvi and xfig in them.
  * The ualr bbs was pulled in from the tapes.  Removed.