Updated to move attenuation to instrument definition file.

Refs #4841
Updated OSIRIS and IRIS parameter files.

Refs #4841
Swapped HandleMonitor to use new parameters.

Refs #4841
Correcting TOSCA parameters to be consistent with the others.

Refs #4841
Refs #4841 Update unit test to count new attenuation parameter.
Merge remote-tracking branch 'origin/feature/4841_params_from_py_to_IDF'
Merge branch 'master' of https://github.com/mantidproject/mantid