Backports for 0.3.1-rc5

[ax3l]

Backports for 0.3.1-rc5:

• XDMF Script: positionOffset for openPMD XDMF Scripts: Fix Replacements & Offset #2309
• KHI example: missing constexpr in input KHI: Fix Build #2310
• bump version number to 0.3.1-rc5

Note:

• compile suite has changed, manual compile test on hypnos was successful

        # Core Dependencies
        module load gcc/4.9.2
        module load cmake/3.3.0
        module load boost/1.62.0
        module load cuda/7.5
        module load openmpi/1.8.6.kepler.cuda75

        # Plugins (optional)
        module load pngwriter/0.5.6

        # HDF5 & Splash
        module load hdf5-parallel/1.8.15
        export SPLASH_ROOT=$HOME/lib/libSplash-1.6.0-cuda75
        export LD_LIBRARY_PATH=$SPLASH_ROOT/lib:$LD_LIBRARY_PATH