Switch Windows Visual Studio project files to Visual Studio 2010 and Microsoft HPC Pack.  This discontinues use of MPICH2 on Windows in favor of Microsoft HPC pack.  Argonne MPICH2 website now points to Microsoft HPC pack for MPICH2.  Visual Studio 2010 is used because more recent versions of Visual Studio do not support the cluster debugger used for parallel debugging.  Version number elevated to 5.2.1