Merge branch 'master' into 'test_refactor_dqc_wrapper'

# Conflicts:
#   dqc_wrapper/checker.py
#   dqc_wrapper/test00_file_format.py
#   dqc_wrapper/test01_standard_compliance.py
#   dqc_wrapper/test02_spatial_completeness.py
#   dqc_wrapper/test03_temporal_completeness.py
#   dqc_wrapper/test04_spatial_consistency.py
#   dqc_wrapper/test05_temporal_consistency.py
#   dqc_wrapper/test06_valid_ranges.py