Changes to 0.2-1:

  o set_options() added

Changes to 0.2:

  o A *lot* of bug fixes
  o closure and reduction of sets added

Changes to 0.1:

  Initial release, implementing data structures and methods for
  o ordinary sets
  o generalized sets (fuzzy sets, multisets, fuzzy multisets)
  o as well as support for fuzzy logic.

  
