Test parameters of whole instrument re #7617

The double valued 'eq' still needs testing.

Signed-off-by: Karl Palmen <karl.palmen@stfc.ac.uk>
Test all except 'eq' attribute re #7617

Signed-off-by: Karl Palmen <karl.palmen@stfc.ac.uk>
Merge branch 'feature/7617_fullprof_to_xml' into develop