Log Message:
Update zoem to 11.166
   *  zoem-11-166 released.

   *  The default search path was changed. The obsolete PREFIX/zoem/mac
      component was dropped, and PREFIX/aephea was added.  Now, if zoem and
      aephea are both configured with the same prefix for installation (e.g.
      --prefix=/usr/local or --prefix=$HOME/local), then aephea include
      -- files
      will be found automatically by zoem.

   *  set#3 can now splice into a variable (that is, the string
      refered to by a macro). This is achieved by pairing the respective
      keys {start} and {width} with appropriate values in the first
      argument to set#3. The start position is relative to an offst
      of zero, so

      \set{foo}{kaboom}
      \set{{start}{2}{width}{3}}{foo}{za}
      '\foo'

      yields 'kazam'.

   *  The example zoem solution 8q2.azm to the N queens problem
      has been updated. It now pretty-prints asciific chess boards using the
      new splice mode to set#3.

   *  Small documentation fixes.