This brings us back to commit 605db515

Previous implementation of C interface passed raw pointers
up to user and it was unclear and inconsistent who owned the pointer
leading to bugs. The previous implementation lead to creation
of many copy constructors, many of which had bugs.

Now we pass opaque pointers to C which the user is *always* responsible for
freeing.

Remove broken copy constructors.

Update C tests so that all pass valgrind memory leak checks.

Changes from ARL's Repo (C Wrappers, DSM rework, Custom Types, Templates, GridControllers, TIFF integration, XdmfAggregate)

Some style. Some fixes, especially for windows with the exports and template changes.

More so adapt this to work well as a subdirectory in a larger project. Don't force settings
that the parent project owns, allow parent project to turn on tests without xdmf's tests and
make the name of the library an option so that parent can have two xdmfs.

Rework of HeavyDataController and HDF5Controller to remove extra code and move HeavyDataController away from being too dependent on hdf5 style
XdmfFunction now supports negative numbers in addition to the - operator
Reworked the interaction between array references and reading
Cleaned up some warnings that showed up in pedantic
Adjusted mpi tests to test against the MPIEXEC variable as opposed to hard calling mpirun
Still needs to be changed to work better with Cray mpi style execution
Updates to XdmfArrayType to allow for signed and floating point checking
General test and Documentation updates

Added subset; modified Array's interaction with Function; added new functionality to XdmfInformation subarrays; adjusted documentation to make more uniform

made changes for preparations to push to master; still need to finish documentation changes and line length changes

Eliminate getRealPath calls which are expensive and not necessary in many cases
Parse XML node content only when necessary (parsing arrays)
Fix cases where copies were made of strings instead of using references
Use "map.insert()" rather than "map[] =" when adding properties to map

Using statements have been added to XdmfSharedPtr.hpp. All used of
boost::shared_ptr and boost::shared_dynamic_cast have been replaced
by shared_ptr and shared_dynamic_cast. Slight modification to XdmfCore.i
to get swig wrapping working again.

Added documentation to several methods. Modified Doxygen configuration file to
correctly process macros (tested using Doxygen 1.7.1). Correctly format
documentation to 80 characters per line.

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

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.

ENH: Change some method names in XdmfArray to be clearer and less verbose.  Modify files for documentation clarity.  Modify some minor things to prevent -Wall warnings in gcc.  Add python install rules and rpathing.

ENH: Revert back to XdmfGridCollection inheriting from XdmfGrid - we want the flexibility to be able to add global sets (might be necessary for dft work).

ENH: Remove XdmfGrid inheritance from XdmfGridCollection.  If there is a need for Sets/Attributes at the "global" collection level then we can deal with it in the future.

ENH: Commit Ken Renard's patches modifying populateItem and XdmfCoreReader to support some xpath functionality for backwards compatibility.

ENH: Make XdmfGridCollection inherit from XdmfGrid and XdmfDomain, since it is really a unity of the two classes.  Modify some details in ItemFactory / Reader.

ENH: Rename get/set ItemProperties for conciseness.  e.g. getAttributeCenter ---> getCenter .  This follows
what is done for XdmfArray (getType).

destructors to be publicly accessible.  Modify tests to work with new wrapping.

ENH: Modify ItemProperties to use shared pointers like the rest of Xdmf.  Modify swig wrapping to correctly
handle both non const and const shared pointers.