Merge remote-tracking branch 'origin/master' into feature/8126_icat4_external_download. Refs #8126.

Conflicts:
	Code/Mantid/Framework/ICat/src/ICat4/ICat4Catalog.cpp
Updated search query for ICat4.3. Refs #8126.
Check if file is datafile before download. Refs #8126.
Search by id rather than name. Refs #8126.
Removed extra zero from label. Refs #8126.
Updated `Facilities.xml` to ICAT4.3. Refs #8126.
Merge branch 'feature/8126_icat4_external_download' into develop. Refs #8126.

Conflicts:
	Code/Mantid/Framework/ICat/src/ICat4/ICat4Catalog.cpp