hdf5_msb

[svn-r19923] BZ 1165: Implemented declaration change;
A static std::basic_string constructed in the Exception class.
  This static isn't one that can be be destructed by H5Library::close(),
but rather gets cleaned up as part of the STL std::basic_string static
destructor when the HDF5 DLL is detached (WINDOWS).
  Looking at the rest of the Exception code, the
DEFAULT_MSG doesn't really need to be a std::basic_string. 
Remove the static constructor and no destructor required.

Tested: local linux - will wait for Nightly Dailies before bringing to 1.8