* An injection exception occurred when launching the MOEA DSE a second
  time from the same AF3 instance. Here, operator modules that maintain
  an internal map keep the entries of the previous run (which are
  replaced). This triggered an equals check of operator keys when the
  operators for the next execution should be placed in the internal
  operator selector maps. Within the equals check, one operator (from
  the prev. execution) had an instance of the operator such that the
  comparision would be based on the operator instances. Thus, an
  operator would be instantiated by the given injector during the
  binding phase causing the Exception.
* In order to obtain a correct operator representation in the internal
  maps an to resolve the above problem, base the Operator Key hash and
  equals method on the OperatorTypes only. We only allow one operator
  type per genotype anyways such that the new equals operation correctly
  implements the concept and "old" operator instances are cleaned out.

Signed-off-by: Alexander Diewald <diewald@fortiss.org>