Added grand canonical features to part command
removed printf from core function
changed return values and fixed some bugs
Debugging and cleaning up
Merge branch 'master' of git://github.com/espressomd/espresso into grandca
Added cuda run test to build system so that configure doesn't erroneously report cuda as working on systems that provide the tools to compile and link cuda code but do not provide the dynamically linked libraries to cuda binaries.
Changed build system so that it leaves out the libraries cudart and cufft if the cuda checks failed. Properly fenced all the code depending on those libraries. Unfortunately the fences don't work because the precompiler constant CUDA gets set even when the checks fail.
Configure script now only defines the symbol CUDA if all checks for cuda, including the run check, succeed. Since in that case, the cuda libraries are left out and all cuda code is fenced off, this should produce a working ESPResSo binary even on system where the cuda build tools are properly set up but the dynamic libraries are not properly referenced.
Extensively tested build system with respect to different proper and broken cuda setups. Found and fixed two more bugs, one in the code fences and one in the cuda indicator for the makefile.
Added location information of cuda headers also to CC, so that header files which contain declarations referencing cuda datatypes can also be processed by compilers other than nvcc.
vtf charges-workaround, prepare_vmd connection moved to vtf

Conflicts:
	scripts/auxiliary.tcl
Updated NEWS.
Fixed logo svg files that were broken after some previous merge.
Merge branch 'grandca' of https://github.com/richter-t/espresso into grandca
Added GRANDCANONICAL to feature list, (c)-header and latex cleanup.
Updated copyright headers and added GPL header to files where it was missing.
Merge branch '3.1'

Conflicts:
	doc/ug/io.tex
	samples/check_potential.tcl
	samples/diamond.tcl
	samples/lj_benchmark.tcl
	samples/maggs.tcl
	scripts/auxiliary.tcl
	tools/series.tcl
	tools/watch.tcl
Added forgotten copyright header and license.
Repaired header inclusion.
Merge branch 'master' of github.com:espressomd/espresso