Merge branch 'release_notes' into 3.1.1

release_notes.md

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+**********************************
+# Release Notes for OpenMDAO 3.1.1
+
+June 12, 2020
+
+OpenMDAO 3.1.1 is a periodic release of OpenMDAO.
+
+This update addresses several issues with distributed models (thanks to @bbrelje) and more improvements to the N2 diagram.
+
+## Backwards Incompatible API Changes:
+
+None
+
+## Backwards Incompatible NON-API Changes:
+
+- Renamed `_post_configure` to `_config_check`, and will no longer support adding inputs/outputs after configure. Any code which previously cached inputs/outputs to be added after configure should now do so directly. #1385
+
+## New Features:
+
+- An error is now Raised if a component has a 0-length array #1391
+- BoundsEnforceLS linesearch no longer warns if bounds are not set #1393
+- Added SVG icons for the N2 toolbar. #1394
+- Added method signature for add_equation to the AddSubtractComp feature doc #1395
+- Added recording of the top level solver abs_err and rel_err to the case recording of Problem #1398
+- Support for group approximation across distributed components in certain cases. #1402
+- The `Group.promotes` method now supports specification of `src_indices`. #1408
+- OpenMDAO now warns the user about out of order parallel components and recommends the use of a NonlinearBlockJac to converge the components in a parallel group. #1412
+- Update docs for options dictionary to include example for `check_valid` argument. #1417
+- Add support for response indices on distributed variables. #1426
+- Raise a RuntimeError rather than excluding pyOptSparseDriver from the API when pyoptsparse is not installed or not installed properly. #1427
+- Added Problem source to list_cases #1428
+- Integrated IPOPT into CI testing #1431
+- Added CI Support for SNOPT 7.7 and PyoptSparse 2.1.0 #1435
+- Also control importing of petsc4py with the use of OPENMDAO_REQUIRE_MPI #1445
+- Adding out_stream option to CaseReader list_* methods #1446
+- Added tests using DOE and GA driver with distributed driver responses . #1450
+- `guess_nonlinear` now works with NonlinearBlockGS #1452
+- User can specify units for KSComp inputs and outputs #1455
+
+## Bug Fixes:
+
+- Improved several N2 resizing issues #1386
+- Fixed a bug when approximating totals on a group that caused derivs to be incorrect if a component under the group had partials declared with the 'val' argument. #1392
+- Fixed N2 search autocomplete appending '.' to results #1399
+- Allow partials on distributed comps with zero-length inputs/outputs on some procs #1400
+- Approximated totals now work for objectives in parallel groups #1404
+- Distributed outputs as driver responses are now supported #1402
+- The N2 home button now restores the diagram to its original state #1409
+- Redundant calls no longer made to the matrix-free API when running under parallel deriv coloring (for fan-out parallel problems). #1413
+- Fix for ParallelComps over allocating processors #1416
+- Fixed N2 toolbar icons overlapping when resized; compacted toolbar #1423
+- Fixed collapsing the zoomed element's parent, as well as other collapse/search bugs #1430
+- Fixed bug during (second) setup. #1447
+- Fixed an out-of-order warning that should not have raised a warning #1451
+
 **********************************
 # Release Notes for OpenMDAO 3.1.0