Initial introduction of the loading of inp.xml by fleur
For very simple test systems fleur can now use the inp.xml file as an input. Note, however, that the functionality is still very incomplete. Therefore, preliminary fleur has to be invoked with -xmlInput to make use of inp.xml. Besides the feature incompleteness it is expected that there are still some bugs in loading inp.xml. So far it is only tested for Si and Fe. For Fe a small deviation from the reference total energy is observed (0.03 mHtr), the magnetic moments are off by 0.003. The cause is yet unknown.
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