Changes to 0.4:

  o fuzzy function generators added

  o extended plotting for fuzzy sets added

  o several functions for memberships transformation added

  o performance of matching operator improved

  o optional universes for gsets added

Changes to 0.3:

  o support for customizable sets (cset) added

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.