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.

ENH: Get equality functions working again, but keep it in the SWIG file rather the polluting the C++.

The TestingSuite should be able to be used on other projects much
more simply than before. Macros were renamed for better understanding.

Added testing for this for both languages as well. In Java
since you are not allowed to overwrite operators, we just
ignore the warning and overwrite .equals. In Python, we
overwrite the operator.

This required addition of getElementSize() member function in
XdmfArray and XdmfArrayType

ENH: Add XdmfGridRegular for CoRectilinear (Regular) Structured Grids.  Add test for interaction and output.

The macros
XDMF_CHILDREN and XDMF_CHILDREN_IMPLEMENTATION

add capabilities to add and remove children by index or property from a parent item.  This simplifies the code
as the same insert() getChild() calls were used throughout the code.

Added macro CLEAN_(language)_TEST() which takes in the executable
name and a list of output files that need to be removed during
'make clean.'

At the top level, this allows you to build just the core or build
everything. If you choose to build just the core you are still able
to wrap it with Java or Python, build testing or the documentation.

Tests that are within core, are now labled as such:
	(language)Core_(TestName)
Also updated format for Java and Python Test Output

The testing suite should make it easier to add new tests. It also
makes use of a single .cmake.in file that gets reconfigured for
each test, instead of creating a new .cmake.in file for each test.
Look into the core/CMake/Use*.cmake files to see how to add new tests.

Within SWIGJAVA, there were a few duplicate ignores and and endif
that I removed.