Get rid of assumption that input and output of a surrogate are always real valued.

...in/java/de/evoal/core/api/ea/fitness/FitnessFunction.java

...de/evoal/core/api/properties/PropertiesSpecification.java

...a/de/evoal/core/api/properties/PropertySpecification.java

...ava/de/evoal/core/api/properties/io/PropertiesReader.java

.../properties/stream/FileBasedPropertiesStreamSupplier.java

...e/src/main/java/de/evoal/core/api/utils/Requirements.java

...c/main/java/de/evoal/core/main/ea/codec/DynamicCodec.java

...voal/core/main/ea/codec/chromosome/DynamicChromosome.java

...ain/ea/constraints/constraint/ast/ConditionConverter.java

...al/core/main/ea/constraints/correlation/el/AstHelper.java

...core/main/ea/constraints/deviation/DeviationProducer.java

...n/java/de/evoal/core/main/ea/fitness/DistanceFitness.java

...va/de/evoal/core/main/producer/SpecificationProducer.java

...ava/de/evoal/generator/api/AbstractGeneratorFunction.java

...gate/api/configuration/FunctionCombinerConfiguration.java

...ogate/api/configuration/PartialFunctionConfiguration.java

...l/surrogate/api/configuration/SurrogateConfiguration.java

...rogate/api/function/AbstractPartialSurrogateFunction.java

...a/de/evoal/surrogate/api/function/ConverterFunctions.java

...ava/de/evoal/surrogate/api/function/FunctionCombiner.java