Refs #8693 Written system tests

Written a new system test ISISReflInstrumentIDFTest.py to test that the changes to the IDFs and Parameter files of POLREF, INTER, SURF and CRISP work properly.
Refs 8693. Fixed mistakes in test.

Not being very used to python i'd made a few syntax errors, as well as a few copy/paste errors.
Refs 8693 Updated reference result

The IDF and parameters had somehting new added, and the old reference result dind't include it, so CheckWorkspacesMatch failed.
The nexus file has been re-saved, so it should now include the new parameters.
refs #8693 Properly updated now

The reference result has been updated, didn't work the first time.
Merge remote-tracking branch 'origin/feature/8693_Refl_IDF_Updates'