Refs #7570 Swapped CubicSpline for BSpline.
Refs #7570 Fix issue with the BSpline swap.
Refs #7570 Swap to using ConvertToPointData algorithm.
Refs #9342 Add proper unit test for DensityOfStates
Refs #9342 Add unit test for IndirectTransmission
Refs #9342 Add unit test for SofQWMoments
Refs #9342 Use method supported by RHEL6.
Refs #9960 Use monitor index parameter from IDF.
Refs #9960 Update IPF files with monitor index.
Refs #9342 Add check for scipy include.
Refs #9342 Fix for broken RHEL6 build.
Refs #9342 Missed import.
Refs #9342 Skip tests (again).
Refs #9990. Added linear background function for POLDI

A function that is linear in workspace index, as a background function for POLDI 2D-fits.
Refs #9342 Better test skipping implementation.
Merge branch 'master', remote-tracking branch 'origin' into bugfix/7570_spline_smooting_error
Refs #9990. Behavior of Poldi2DFunction now match CompositeFunction
Refs #9990. PoldiCalculateSpectrum2D now has background terms

Background functions are added if specified by the user.
Refs #9990. Cleaning up.
Refs #9990. Removing debug output.