Merge branch 'B_bar_linear' into 'master'

...le/prj/processes/process/SMALL_DEFORMATION/t_use_b_bar.md

Documentation/bibliography/other.bib

ProcessLib/Deformation/BMatrixPolicy.h

ProcessLib/Deformation/LinearBMatrix.h

...essLib/SmallDeformation/CreateSmallDeformationProcess.cpp

ProcessLib/SmallDeformation/MaterialForces.h

ProcessLib/SmallDeformation/SmallDeformationFEM.h

ProcessLib/SmallDeformation/SmallDeformationProcessData.h

ProcessLib/SmallDeformation/Tests.cmake

Tests/Data/Mechanics/CooksMembrane/CooksMembrane.prj

.../Mechanics/CooksMembrane/CooksMembraneSDRefinedMesh10.xml

.../Mechanics/CooksMembrane/CooksMembraneSDRefinedMesh15.xml

.../Mechanics/CooksMembrane/CooksMembraneSDRefinedMesh20.xml

.../Mechanics/CooksMembrane/CooksMembraneSDRefinedMesh25.xml

.../Mechanics/CooksMembrane/CooksMembraneSDRefinedMesh30.xml

Tests/Data/Mechanics/CooksMembrane/boundary.gml

...Membrane/cooks_membrane_sd_edge_div_4_ts_1_t_1.000000.vtu

...ane/cooks_membrane_sd_refined_mesh_10_ts_1_t_1.000000.vtu

...ane/cooks_membrane_sd_refined_mesh_15_ts_1_t_1.000000.vtu

...ane/cooks_membrane_sd_refined_mesh_20_ts_1_t_1.000000.vtu