Merge remote branch 'origin/feature/8028_fix_windows_7_db_build'
Merge remote branch 'origin/feature/8022_snsconverttomdeventstest_revamp'
Change call of FlatBackground to CalculateFlatBackgound re #6977

This was done in PolrefExample.py.

Signed-off-by: Karl Palmen <karl.palmen@stfc.ac.uk>
Merge branch 'feature/6977_remove_flatbackgound_alg' into develop