first pass of QB chapter - Qualitative Benchmarks

docs/source/index.rst

docs/source/qb/biseg.rst

docs/source/qb/figs/boyce_sb_1908_small.png

docs/source/qb/figs/granRT_1908_small.png

docs/source/qb/figs/hcs_ke_1908.png

docs/source/qb/figs/hcs_xy_1908.png

docs/source/qb/figs/mehrdad_1908_small.png

docs/source/qb/figs/netl_biseg_1908_small.png

docs/source/qb/granRT.rst

docs/source/qb/hcs.rst

docs/source/qb/index.rst

docs/source/qb/mehrdadsbed.rst

docs/source/qb/refs.rst

docs/source/qb/single_bubble.rst