Hopefully this will become a standard style for Xdmf development.
All spaces - 80 character line wrapping.

Makes identifying required variables easier for users,
especially for hdf5 variables where only the C library is needed
for linking.

Example: XdmfVersion.getFull() returns a version string 'Xdmf 2.0'
         XdmfVersion.getShort() returns a version string '2.0'
         XdmfVersion.getMajor() returns an int for major '2'
         XdmfVersion.getMinor() returns an int for minor '0'

Before, if you had an element and text within an element, you were unable to get the text unless it was before the element.
    Example: <node>text<param/></node> (this will work)
             <node><param/>text</node> (this would not work)

Also added extra install commands.

ENH: Modify wrapping of XdmfArray to always use "insert" and not "copy".  Also add template specializations to allow for initialize calls.

ENH: Rename all subclasses of XdmfGrid to more syntactically friendly names: i.e. XdmfGridUnstructured to XdmfUnstructuredGrid.

ENH: Cleanup comments and inheritance syntax a bit.  Remove unnecessary Geometry Types not needed since splitting structured and unstructured grids
into separate hierarchies.

ENH: Added XdmfGridUnstructured and turned XdmfGrid into an abstract base class for all grids (both structured and unstructured).  Modified a bunch of utils and other classes
to fit this new hierarchy.

Cleanup: 1. XdmfArray -- took out getElementSize() 2. XdmfArrayType -- took out IsEqual() 3. Xdmf.i -- implement IsEqual() function here for Python and Java in XdmfArrayType and XdmfItem (see #2 and #5) 4. Xdmf.i -- getNumpyArray uses getElementSize on XdmfArrayType instead of on XdmfArray (see #1) 5. XdmfItem -- took out IsEqual() 6. XdmfWriter -- made setDocumentTitle() and setCersionString() protected functions 7. Java test TestXdmfEquals -- took out test of XdmfItem->IsEqual()

ENH: Add XdmfHeavyDataController base class and make XdmfArray use it.  Add XdmfHeavyDataWriter base class and make XdmfWriter use it.  This is in preparation to add additional heavy data formats.