* v 0.1
  * first release

* v 0.2
  * new CollectErrors wrapper
  * CN, specialisation of CollectErrors to NumErrors
  * numerical partial operators (eg division) return a CN type
  * instances for Data.Complex

* v 0.2.0.1
  * fix compilation bug in test suite
  * minor doc improvements
  * fix Complex instances of error-throwing division (/!)