 - Solved xdmf node removal bug (using absolute xdmf node path leads to    errors when removing a node --> pathes change in xdmf tree but not    in h5 attributes, and update is cumbersome)      --> moved to store absolute xdmf path of nodes as h5 attributes to          storage of xdmf grid nodes and attribute nodes `Names`.
 - Solved xdmf node removal bug (using absolute xdmf node path leads to
   errors when removing a node --> pathes change in xdmf tree but not
   in h5 attributes, and update is cumbersome)
     --> moved to store absolute xdmf path of nodes as h5 attributes to
         storage of xdmf grid nodes and attribute nodes `Names`.

 - Solved xdmf indentation and line break issues when adding new nodes
   to a preexisting dataset file

heprom/pymicro