CHANGES

# changes since the last release

  -- Added a load balance approach to Amr/AmrLevel.  The runtime
     parameters for this is amr.loadbalance_with_workestimates and
     amr.loadbalance_level0_int.  The latter is for single level
     (i.e., amr.max_level=0) only.  For multi-level runs, load balance
     is done during regrid and thus the load balance interval is
     controlled by amr.regrid_int.  To use this approach, AmrLevel
     derivative must has a StateData for work estimates and its index
     is returned by virtual function int WorkEstType().

  -- MFIter now supports dynamic scheduling of OpenMP threads.  For
     example,
 
       for (MFIter mfi(mf, MFItInfo().SetDynamic(true).EnableTiling(tile_size);
            mfi.isValid(); ++mfi)
       { ... }

  -- Added EBFluxRegister to Src/EB for refluxing and
     re-redistribution in EB.

  -- amrex.signal_handling = 1 is a new runtime parameter that can be
     used to control whether AMReX should handle signals like SIGSEGV
     etc. 

  -- functions for printing to a file in a parallel and thread-safe manner
     have been added. For example:

        amrex::AllPrintToFile("output") << "Hello from rank " << rank << 
                                           " and thread " << thread << "\n";

     will print out the requested information to separate files for each 
     rank and thread.