Cleaning up gpu_utils
Enabled and fixed some problems with the compiler
Merge branch 'asc' into dk-dev

Conflicts:
	src/gromacs/gmxlib/gpu_utils/gpu_utils.cpp
Remove AMD specific option for kernel compilation as it was not needed anymore
Fixed an issue with the build error not being reported correctly
Enable all kernels and fix compilation
Bug fixes in the compiler
Fixed compilation issues with GPU off and OpenCL off
Fix Cmake install issue.
Due to a a misconfiguration in a Cmake script (installation of ishift.h for OpenCL) the installation would fail to complete