Merge pull request #3119 from jsquyres/pr/v2.1.0/readme-updates

v2.1.0: README: More updates for v2.1.0

Author: jsquyres

NEWS

@@ -53,8 +53,8 @@ included in the vX.Y.Z section and be denoted as:
    (** also appeared: A.B.C)  -- indicating that this item was previously
                                  included in release version vA.B.C.
 
-2.1.0 -- specific date TBD
--------------------------
+2.1.0 -- March, 2017
+--------------------
 
 Major new features:
 
@@ -97,6 +97,8 @@ Bug fixes/minor improvements:
     traces to be reported (or <=0 to wait forever).
   - mtl_ofi_control_prog_type/mtl_ofi_data_prog_type: specify libfabric
     progress model to be used for control and data.
+- Fix a name collision in the shared memory MPI IO file locking
+  scheme.  Thanks to Nicolas Joly for reporting the issue.
 - Fix datatype extent/offset errors in MPI_PUT and MPI_RACCUMULATE
   when using the Portals 4 one-sided component.
 - Add support for non-contiguous datatypes to the Portals 4 one-sided