[svn-r3199]

Purpose: bug fix

Description:
	I found a couple of places where virtual destructors were missing
	and could cause small memory leaks.  Also, some destructors were
	not virtual when they should be.

Solution:
	- added virtual destructors, which also free dynamically allocated
	  memory
	- added virtual to several destructors
	- also, fixed several typos

Platforms tested:
	Solaris 2.7 (arabica)

c++/src/H5DataSpace.cpp

@@ -56,10 +56,7 @@ void DataSpace::copy( const DataSpace& like_space )
    id = H5Scopy( like_space.getId() );
 
    // points to the same ref counter
-   ref_count = like_space.ref_count;
-
-   // increment ref counter to indicate additional references to this id
-   ref_count->increment();
+   ref_count = new RefCounter;
 
    if( id <= 0 )
    {