EwaldGPU added
Break-command added in communication.cpp
Ewald tcl-files added
#ifdef EWALD_GPU added
tcl-file: addEwaldgpuForce
tcl-file: Removed comments
Renamed Ewald-tcl-files
Merge remote-tracking branch 'upstream/master' into EwaldGPU
avoid to delete __init__.py so that make after make clean does not fail
added rdf as core observable so that it can be used for averaging
Merge branch 'master' of https://github.com/espressomd/espresso

Conflicts:
	src/python/espressomd/Makefile.am
All Ewald changes to new SystemInterface
Testsuite ewaldgpu
Ewald: CUDA-part works, but short-range-part not
Merge remote-tracking branch 'upstream/master' into EwaldGPU

Conflicts:
	src/core/Makefile.am
	src/core/energy.hpp
	src/core/forces.hpp
	src/features.def
Ewald: Introduced ActorList
Ewald: CUDA works, but problems with mpi and short range
Ewald: Small changes
Makefile
Ewald: Small changes