Added bullet about 0 byte MPI_ALLOC_MEM requests

This commit was SVN r15594.

NEWS

@@ -61,6 +61,9 @@ Trunk (not on release branches yet)
   support a LAM/MPI-like protocol.
   --> Expected: 1.3
 
+- Fix 0 sized MPI_ALLOC_MEM requests.  Thanks to Lisandro Dalcin for
+  pointing out the problem.
+  --> Expected: 1.2.x
 - Fixed a segfault crash on large SMPs when doing collectives.
   --> Expected: 1.2.4
 - Fix a problem with MPI_BOTTOM in various places of the f77-interface.