update CHANGES for 20.09 (#1334)

CHANGES

@@ -1,3 +1,80 @@
+# 20.09
+
+  -- Fix interpolation coefficients for EB stencil in cell-centered linear
+     solvers when the EB surface at the domain boundary is tilted.
+
+  -- Add a parameter to `AMReX_omp_mod` that can be used by Fortran code to
+     check whether AMReX was built with OpenMP support, and, if yes, what
+     the version number (_OPENMP) was at the time AMReX was compiled.
+
+  -- CMake: re-write genex evaluation functions.
+
+  -- Extend the number of unique particles per cpu we can have at once.
+
+  -- Add a new method to the `amrex_distromap` type in
+     F_Interfaces. `get_pmap` fills a caller-owned array of PEs.
+
+  -- Fix a long standing bug in GNU make system on the use of HOST and
+     HOSTNAME.
+
+  -- Add Scan::InclusiveSum and ExclusiveSum for CPU to avoid ifdef.
+
+  -- Add check for empty probin_file in Amr::restart.
+
+  -- Update Sundials interface, documentation, and build to be version
+     agnostic.
+
+  -- Updates for ROCm 3.6 and 3.7.
+
+  -- Add section to Make.unknown for intel mpi.
+
+  -- CMake: re-factor third party libraries setup.
+
+  -- Port TagBoxArray to GPU.
+
+  -- Fix a bug in matching of COMP_VERSION to correctly treat CCE > 9.
+
+  -- By default, EB outside the domain will be generated by extending from
+     the domain faces.
+
+  -- Fix an issues due to roundoff error in determining whether particles
+     are inside the domain.
+
+  -- Remove Perilla because it's incompatible with our GPU strategy and it's
+     no longer being maintained.
+
+  -- Switch the overset mask convention to that 1 means unknown and 0 means
+     known.  The new convention is more convenient for AMR-Wind.
+
+  -- Remove old solvers, Src/LinearSolvers/C_CellMG and C_TensorMG.  They
+     have been superseded by Src/LinearSolvers/MLMG.
+
+  -- MacProjector: allow for re-use of the object and enhance multi-level
+     algorithm.
+
+  -- Add asserts for bounds checking to Array1D and Array2D.
+
+  -- Optimization of the construction of SFC.
+
+  -- Refactoring of particle buffer map.
+
+  -- Optimization of FPinfo and complementIn.
+
+  -- Move the Amr/Extrapolater used in IAMR/PeleLM to C++/GPU compliant.
+
+  -- Less surprising behavior for the ok() method of FabArray. This makes
+     the `ok()` method of FabArray return `false` instead of crashing if the
+     `define()` method has yet to be called.
+
+  -- Optimization of regrid.
+
+  -- Special FillBoundary for Almo.
+
+  -- Fix the average_down_faces calls in linear solvers to see periodicity.
+
+  -- Make sure the calculation of divu at inflow face in nodal projection
+     does not use tangential velocities on an inflow face.
+
 # 20.08
 
   -- New average_down_faces functions that take periodic boundary into account.