NEWS: sync with v1.8.x branch

NEWS

@@ -84,6 +84,11 @@ Master (not on release branches yet)
 - Fixed trivial typo in MPI_Neighbor_allgather manpage
 - Fixed tree-spawn support for sh and ksh shells
 - Several data type fixes
+- Fixed IPv6 support bug
+- Cleaned up an unlikely build issue
+- Fixed PMI2 process map parsing for cyclic mappings
+- Fixed memalign threshold in openib BTL
+- Fixed debugger access to message queues for blocking send/recv
 
 
 1.8.5