remove older mpich test suite
remove few tests which may never finish, and change one that used too much stack size
first commit to add the mpich-test suite to smpi tesh suite. Obviously all tests don't complete correctly, so we will only execute a (pretty good) part of it, but all tests should compile with smpi (at least C ones for now, fotran needs more work) Conflicts: CMakeLists.txt buildtools/Cmake/AddTests.cmake