Merge branch 'feature/8924_Intrument_file_repo'
Merge remote-tracking branch 'origin/feature/9340_dos_scattering_cross_sections'
Merge branch 'feature/10432_POLDI_residual_analysis'
Add multiple summing tests for Vesuvio

Refs #10170
Merge branch 'feature/10170_loadvesuvio_sum_multiple_spectra' into develop