Inclusion of Larmor IDF file

re #7998
Add Larmor to Facilities.xml

re #7998
Correct the dates for Larmor IDF

re #7998
Add Larmor Parameters file

It includes the parameter that tells Mantid to load the detectors positions
(parameter map) form the Nexus file.

re #7998
Update FacilityInfoTest to consider LARMOR

re #7998
Revert "Add Larmor Parameters file"

This reverts commit d6f1eed47eb8e48287022516ff3a00071dc6e50c.

The reason is that what is forseen is that the Larmor file will have
the option to load the detector inside its own file. So, we do not need
the parameter file.
Merge remote-tracking branch 'origin/feature/7998_larmor_idf'