Adding libxml2 binaries for upcoming HDF5 plugin writer update

I added libxml2 support for Windows compilation. A new folder xml2Support was added to ADBinaries which contains the header files and compiled libraries. 
The library was built and tested using MS Visual Studio 2010. It was tested on Windows 7 with a build for 32 bit and 64 bit.

Shared libraries were built with /MD flag, static were built with /MT flag.
Test were run with ADCore/hdf5_xml branch. Note changes were made to hdf5_xml branch in order to fix compile errors.