Remove debug output from RESOL DeltaSol BX Plus tests.
Refactor and document `ConfigurationOptimizer` class.
Change `BaseConfigurationOptimizer` to adapt changes in its base class.
Change `Customizer` to adapt to changes in `ConfigurationOptimizer`.
Change `ConnectionCustomizer` to adapt to changes in its base class.
Change DeltaSol BX Plus config optimizer tests to adapt base class changes.
Change `Customizer` to adapt to changes in `ConfigurationOptimizer`.
Fix several bugs in `BaseConfigurationOptimizer`.
Fix several bugs in `ConnectionCustomizer`.