[svn-r13200] Purpose: Adding wrappers and fixing a bug

Description:
    - Added overloaded function DataType::copy to take a DataSet
    - Added overloaded DataType::commit
    - Fixed bugzilla 797
    - Fixed a warning in DataSpace::operator=
    - Set PropList parameter to default in DataType::convert

Platforms tested
    AIX 5.1 (copper)
    SunOS 5.8 64-bit (sol)
    HPUX 11.00 (kelgia)

c++/src/H5DataSpace.cpp

@@ -136,10 +136,8 @@ void DataSpace::copy( const DataSpace& like_space )
 DataSpace& DataSpace::operator=( const DataSpace& rhs )
 {
     if (this != &rhs)
-    {
-	copy(rhs);
-	return(*this);
-    }
+        copy(rhs);
+    return(*this);
 }
 
 //--------------------------------------------------------------------------