Adding error parametrization for MM simple clustering
This MR adds the options to use a parametrization (provided by @rosati) of the error in the MMSimpleClusterBuilderTool. In the default configuration the old error is used.
This MR adds the options to use a parametrization (provided by @rosati) of the error in the MMSimpleClusterBuilderTool. In the default configuration the old error is used.