Merge remote branch 'origin/bugfix/7098_slice_view_peaks_list'
Merge remote branch 'origin/feature/7091_bias_data_in_splatterplot'
Re #7214. Switch SNSPowderReduction from using boostmpi to mpi4py.
Re #7213. Switch examples to us mpi4py in place of boostmpi.
Merge branch 'feature/7214_mpi4py_replaces_boostmpi' into develop