Xdmf writer serial with xdmfdiff

Tobias Meiselrequested to merge
TobiasMeisel/ogs:XDMFWriter_serial2 into master

OGS now supports XDMF File format as output. This current state of XDMFWriter contains no optimizations. Parallel writing of XDMF is not (yet) supported.

To use change inside prj -File from:

<timeloop><output><type>VTK</type>

to:

<timeloop><output><type>XDMF</type>

Edited by Tobias Meisel

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