[svn-r30309] Purpose: Fix bug HDFFR-9920

Description:
    Rearranged the classes to model the relationship of HDF5 objects more
    accurately.  The changes included:
    - moved CommonFG's methods to Group
    - removed CommonFG from Group's base class list
    - removed CommonFG from H5File's base class list and changed
      "public H5Location" to "public Group" in the base class list
    - CommonFG became unused
    - result of the modified partial class diagram:

                                IdComponent
                                     |
                                H5Location
                                /
                        H5Object
                           |
                        /  /  \
                DadaType Group DataSet
                          |
                        H5File
Platforms tested:
    Linux/32 2.6 (jam)
    Linux/64 (platypus)
    Darwin (osx1010test)

c++/src/H5File.h

@@ -17,6 +17,7 @@
 #ifndef __H5File_H
 #define __H5File_H
 
+
 #ifndef H5_NO_NAMESPACE
 namespace H5 {
 #endif
@@ -26,7 +27,7 @@ namespace H5 {
 
     It inherits from H5Location and CommonFG.
 */
-class H5_DLLCPP H5File : public H5Location, public CommonFG {
+class H5_DLLCPP H5File : public Group {
    public:
 	// Creates or opens an HDF5 file.
 	H5File( const char* name, unsigned int flags,
@@ -80,9 +81,6 @@ class H5_DLLCPP H5File : public H5Location, public CommonFG {
 #ifndef DOXYGEN_SHOULD_SKIP_THIS
 	void reopen();  // obsolete in favor of reOpen()
 
-	// Gets the file id
-	virtual hid_t getLocId() const;
-
 	// Creates an H5File using an existing file id.  Not recommended
 	// in applications.
 	H5File(hid_t existing_id);
@@ -95,6 +93,9 @@ class H5_DLLCPP H5File : public H5Location, public CommonFG {
 	// Throw file exception.
 	virtual void throwException(const H5std_string& func_name, const H5std_string& msg) const;
 
+	// for CommonFG to get the file id.
+	virtual hid_t getLocId() const;
+
 	// Default constructor
 	H5File();
 
@@ -125,3 +126,4 @@ class H5_DLLCPP H5File : public H5Location, public CommonFG {
 }
 #endif
 #endif // __H5File_H
+