Added Optimize() in CreateFS.abort(). quick fix for Redmine #736 (https://projects.uni-konstanz.de/issues/736):   If DeepFS construction is canceled, meta data seems to get lost:   meta.height is set to 0, which causes problems in the TreeView.
Added Optimize() in CreateFS.abort().
quick fix for Redmine #736 (https://projects.uni-konstanz.de/issues/736):
  If DeepFS construction is canceled, meta data seems to get lost:
  meta.height is set to 0, which causes problems in the TreeView.

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