Static mesh xdmf writer
Xdmf3Writer supports now this features:
- TimeSeries: Reduce number of files: Multiple Timesteps in a single file
- Static Mesh: Reduce data size and writing time as only the changing parts of the mesh will be written (const = Topology+Geometry, variable = Properties)
- Direct use of HDF5: Now opens the possiblity for writing chunked data (all partitions into a single file, and possiblity for HDF5 parallel writing based on collective MPI IO)
Open Points: Improved errorhandling, multi-mesh-output, iteration result output, integration points, TODOs marked