Merge branches 'galilei' and 'galilei_transform' into galilei_transform
Also included the files I missed earlier.
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.
Simple angular velocity observable added, must still add more complex angular auto-correlation function.
new velocity boundary conditions for LBPU

the implementation is completely analogous to the CPU implementation
Repaired compilor error in case ROTATION feature is not compiled in.
Added external torque to the EXTERNAL_FORCES feature. Added documentation on the external torque to the user's guide as well as on the particle_angular_momentum observable. Removed some depricated commands from the .tcl files in the scripts, samples and testsuite folders, such that the command names from the GALILEI feature are now used.
Merge branch 'master' into torque
fixed the pressure tensor calculation for LB

and added a quite powerful testcase that
checks Couette and Poisseuille flow and
hydrostatic pressure in planar geometries
added pressure calculation for GPU
Merge branch 'lbgpu_development'
Committing
Merge branch 'kessel_master' into espresso-object-in-fluid
fixed pressure tensor for GPU LB and made testcase
I used the citebox environment, clered mpi_rank calls, cleaned all the warnings at the compilation...
just testing