[svn-r9349] Purpose: New feature enhancement

Description:  enable size adjustment for compound datatype.  The size
can be increased and decreased(as long as the last member isn't cut).

Solution:  mainly check if the last member is being cut when decreasing
the size.  Others are simply taking out assertion to enable this feature.

Platforms tested:  h5committest and fuss.

Misc. update:  RELEASE.txt

release_docs/RELEASE.txt

@@ -50,6 +50,10 @@ New Features
 
     Library:
     --------
+        - Compound datatype has been enhanced with a new feature of size 
+            adjustment.  The size can be increased and decreased(without
+            cutting the last member).  No API change is involved.  SLU - 
+            2004/10/1
         - Put back 6 old error API functions to be backward compatible with
             version 1.6.  They are H5Epush, H5Eprint, H5Ewalk, H5Eclear,
             H5Eset_auto, H5Eget_auto.  Their new equivalent functions are