Fixing fANOVA support for Constant by
1) turning all Constants to one-value categoricals in the configspace passed to fANOVA
2) fixing the configspace (to the new "corrected" one) for all the configs in the runhistory when preprocessing data for fanova
Fixing fANOVA support for Constant by 1) turning all Constants to one-value categoricals in the configspace passed to fANOVA 2) fixing the configspace (to the new "corrected" one) for all the configs in the runhistory when preprocessing data for fanova