Merge branch 'feature/9445_systemtest_for_poldi_2d_spectrum'
Merge branch 'feature/9630_poldi_truncate_data_test'
Merge branch 'feature/9436_poldi_merge_system_test'
Merge branch 'feature/10074_merge_poldi_system_tests'
Modify indirect system tests to reflect refactoring

Refs #9344
Merge branch 'bugfix/9344_indirect_pep8_python_refactor' into develop