Unused reference files removed.

Tests/Functional/PyCore/persistence/CMakeLists.txt

Tests/ReferenceData/legacy/customformfactor_reference.int.gz

...s/ReferenceData/legacy/ffba_anisopyramid_reference.int.gz

Tests/ReferenceData/legacy/ffba_box_reference.int.gz

Tests/ReferenceData/legacy/ffba_cone6_reference.int.gz

Tests/ReferenceData/legacy/ffba_cone_reference.int.gz

.../ReferenceData/legacy/ffba_cuboctahedron_reference.int.gz

Tests/ReferenceData/legacy/ffba_cylinder_reference.int.gz

...ReferenceData/legacy/ffba_ellipscylinder_reference.int.gz

Tests/ReferenceData/legacy/ffba_fullsphere_reference.int.gz

...s/ReferenceData/legacy/ffba_fullspheroid_reference.int.gz

.../ReferenceData/legacy/ffba_hemiellipsoid_reference.int.gz

Tests/ReferenceData/legacy/ffba_prism3_reference.int.gz

Tests/ReferenceData/legacy/ffba_prism6_reference.int.gz

Tests/ReferenceData/legacy/ffba_pyramid_reference.int.gz

Tests/ReferenceData/legacy/ffba_sphere_reference.int.gz

Tests/ReferenceData/legacy/ffba_spheroid_reference.int.gz

Tests/ReferenceData/legacy/ffba_tetrahedron_reference.int.gz

.../ReferenceData/legacy/ffba_truncatedcube_reference.int.gz

Tests/ReferenceData/legacy/isgisaxs03_reference_BA.int.gz