Version 0.22 

* fixed two bugs in makefiles and util/
  (thanks to Franklin Chen)

Version 0.21 

* ported implementation to SML/NJ version 110 (removed
call to function ListFormat.formatList in file red.sml)

* changed function match (gr_t.sml) so that loops are now 
properly matched

* extended graph reducer and combinator expression translator
to account for Y combinator

* changed graph reducer (function combRed, file red.sml) to
properly terminate on partially applied combinators

* several minor changes in examples files

Version 0.20 (alpha release)