Merge remote-tracking branch 'origin/stdv10_valid_ranges' into unit_tests

# Conflicts:
#	dqc_wrapper/checker.py
#	dqc_wrapper/conf/conf_test04_6.ini
#	dqc_wrapper/test02_spatial_completeness.py
#	dqc_wrapper/test06_valid_ranges.py
#	dqc_wrapper/utils/utils_xarray.py