Merge release-5-0 into master

Merge release-5-0 into master

Conflicts:
	CMakeLists.txt
Version numbers not bumped; fixed to use the right
name for RelWithDebInfo.

	cmake/gmxCFlags.cmake
Fixed to use the right name for RelWithDebInfo.

	src/gromacs/listed-forces/bonded.cpp
New RB SIMD function in bonded.cpp had unused variables, now
eliminated

	src/gromacs/mdlib/domdec.cpp
Bug fixes from release-5-0 incorporated. std::max now used in code
newly arrived from release-5-0.

md.cpp had no conflict, but fr->nbv->bUseGPU had to
be replaced by use_GPU(fr->nbv) to work in master branch.

Change-Id: I65326b691745111fbdaa9435be6c92fa1acf6e7d