Used AnyDataHandle for FastClusterContainers

As FastClusterContainer no more inherits from DataObject, AnyDataHandle has to be used in FastSTDecoding and FastVeloDecoding algorithms. Note that these algorithms could not trivially been converted to using Transformer as they write to different ouput locations depending on an extra property ("compare"). This latter can/should be fixed by splitting the algorithms, and using the python 'SuperAlgorithm' wrapper to present them as a single configurable entity.