2018.3

subsequent patch release

Related issues
	Bug #2397: Difference between single rank and multiple rank when pulling using constraints relative to rest of the system
	Bug #2420: OpenCL implementation not doing device sanity checks
	Bug #2421: EwaldUnitTests and SimdUnitTests fail on ppc64le with gcc-8.0.1
	Bug #2468: incorrect GPU timing reported with OpenCL and domain decomposition
	Bug #2470: memory leak in OpenCL runs with
	Bug #2474: Double free/corruption for gmx solvate when topol.tpr explicitly listed as input argument and gmx built with mpi
	Bug #2480: pdb2gmx does not protonate correctly for united-atom Gromos
	Bug #2544: gmx rmsf does not fix periodicity in reference structure
	Feature #2545: Should grompp fix periodicity of input files?
	Task #2359: r2018 docs tweaks/corrections necessary

GROMACS