Merge pull request #3209 from jsquyres/pr/v2.1.0/NEWS-bullets

NEWS: more bullets for v2.1.0

Author: jsquyres

NEWS

@@ -97,6 +97,11 @@ 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 MPI_WTICK regression where the time reported may be inaccurate
+  on systems with processor frequency scalaing enabled.
+- Fix regression that lowered the memory maximum message bandwidth for
+  large messages on some BTL network transports, such as openib, sm,
+  and vader.
 - Fix a name collision in the shared file pointer MPI IO file locking
   scheme.  Thanks to Nicolas Joly for reporting the issue.
 - Fix datatype extent/offset errors in MPI_PUT and MPI_RACCUMULATE