correct no boost reading of XML data

David E. DeMarlerequested to merge
demarle/xdmf:fixes-for-noboost into master

Just fixed some typos in the CXX side or the ifdef to match the boost side. With these (and a slight increase in temporal tolerance) the VTK xdmf tests pass.

And finally no BOOST! Kudos to Andrew for doing the hard work.

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