[svn-r22235] Purpose: Fixed bugs HDFFV-2761 & HDFFV-7852

Description:
    - Replaced PredType::NotAtexit() with PredType::AtExit(H5CPP_EXITED);
      and used PredType::AtExit as a flag to detect when all predefined
      types have been destroyed.  Then, H5close will be called to terminate
      the library after its being re-initiated when the PredType destructors
      were activated.  This change removed the memory leaks shown by the
      user's sample program.
    - Added H5CPP_EXITED for PredType::AtExit to use as a flag
    - Updated some inaccurate comments
    - Removed stream functions from FileAccPropList
    - Replaced H5_VMS with appropriate macro in H5IdComponent.cpp
    - Corrected many URLs (hdfgroup vs. ncsa) in comments
    - Replaced std::string with H5std_string in comments
Platforms tested:
    Linux/32 2.6 (jam)
    Linux/64 2.6 (amani)
    SunOS 5.10 (linew)

c++/src/H5IdComponent.cpp

@@ -13,11 +13,13 @@
  * access to either file, you may request a copy from help@hdfgroup.org.     *
  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
 
-#ifdef H5_VMS
+#ifdef OLD_HEADER_FILENAME
+#include <iostream.h>
+#else
 #include <iostream>
-#endif /*H5_VMS*/
-
+#endif
 #include <string>
+
 #include "H5Include.h"
 #include "H5Exception.h"
 #include "H5Library.h"
@@ -129,7 +131,7 @@ int IdComponent::getCounter() const
 //--------------------------------------------------------------------------
 // Function:	hdfObjectType
 ///\brief	Given an id, returns the type of the object.
-///return	a valid HDF object type, which may be one of the following:
+///\return	a valid HDF object type, which may be one of the following:
 ///		\li \c H5I_FILE
 ///		\li \c H5I_GROUP
 ///		\li \c H5I_DATATYPE