Add 5.2.1 changes.

clawpack · Sep 25, 2014 · a98373a · a98373a
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+#5.2.1 release
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+- **New 3D Euler examples**: Sedov blast, shock tube, and shock-bubble interaction, with IPython notebooks showing how to visualize.  The Sedov example has a test using HDF5 files.
+- **New interface to boundary condition routines**: the routines for setting q and aux both get both q and aux now.  The old interface is supported for backward compatibility until 5.3.  All examples have been updated to use the new interface.
+- New 2D Euler example: flow over a forward-facing step.  It runs, but the solution blows up with the Roe solvers; this is a known issue.
+- In SharpClaw, the total fluctuation solver can now be specified in a manner similar to how the Riemann solver is specified.  The 1D Euler examples demonstrate this.
+- The Riemann solvers in clawpack.riemann now have defined constants for each conserved quantity.  Many of the PyClaw examples have been updated to use those for indexing into the q array.
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 # 5.2.0 release
 
 - **Linear multistep methods for timestepping in SharpClaw**: