JsonConfig: Fixed Namespace.__eq__() when 'other' is None.
OpCachedTiledVolumeReader: Fixed cache type.  Added output for uncached data, too.
TiledVolume: OpInputDataReader uses cached or non-cached output depending on a setting in the volume description.
OpCachedTiledVolumeReader: Moved decision to use cached or uncached output into the volume reader op, not the parent generic reader op.