Add README files to clawpack solvers to include copyright notices for…

… Clawpack

src/solvers/fc2d_clawpack4.6/README

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+Notes on the Clawpack 4.6 solver extension in ForestClaw:
+
+FORTRAN code and files for this ForestClaw CLAWPACK solver extension were 
+taken originally from the open source project Clawpack: 
+
+    Clawpack Copyright (c) 1994-2025 Clawpack Developers, BSD license: 
+
+         https://github.com/clawpack/clawpack/blob/master/LICENSE
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+Also see http://www.clawpack.org
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+Some of the Clawpack files used here have been modified to suit purposes in ForestClaw. 
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src/solvers/fc2d_clawpack5/README

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+Notes on the Clawpack 5.0 extension of ForestClaw :
+
+FORTRAN code and files for this ForestClaw CLAWPACK solver extension were 
+taken originally from the open source project Clawpack: 
+
+    Clawpack Copyright (c) 1994-2025 Clawpack Developers, BSD license: 
+
+         https://github.com/clawpack/clawpack/blob/master/LICENSE
+
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+Also see http://www.clawpack.org
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+Some of the Clawpack files used here have been modified to suit 
+purposes in ForestClaw. 
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src/solvers/fc2d_geoclaw/README

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-# ------------------------------------------
-# Notes on porting geoclaw to ForestClaw
-# Donna Calhou and Melody Shih
-# New York (Courant visit); 4/21-4/24 (2016)
-# ------------------------------------------
+Notes on the Clawpack/GeoClaw solver: 
+
+FORTRAN code and files for the ForestClaw Geoclaw extension were 
+taken originally from the open source project Clawpack: 
+
+    Clawpack Copyright (c) 1994-2025 Clawpack Developers, BSD license: 
+
+         https://github.com/clawpack/clawpack/blob/master/LICENSE
+
+
+Also see http://www.clawpack.org
+
+
+Some of the Clawpack/GeoClaw files used here have been modified to suit 
+purposes in ForestClaw. 
+
+
 
-Changes that are more than just name changes are designated with "FORESTCLAW"
 
-1. Create directory fc2d_geoclaw.
 
-1. Copy clawpack5 library files (fc2d_clawpack5.{cpp,h} to
-   fc2d_geoclaw.{cpp,h}.   Change names accordingly.
 
-2. Create directories geolib_source, amrlib_source, fortran_source,
-   riemann_source
-   -- geolib_source : all files from clawpack/geoclaw/src/2d/shallow
-   -- amrlib_source : some files from clawpack/amrclaw/src/2d;
-   -- fortran_source : additional files needed to interface with
-      ForestClaw.
-   -- Copy Riemann solvers (rpn2_geoclaw.f90, rpt2_geoclaw.f90,
-      geoclaw_riemann_utils.f
 
-3.  Change names of basic files : qinit.f90, setaux.f90, src2.f90,
-    b4step2.f90, step2.f90, bc2.f90 to geoclaw_<name>.f90.  Names
-    of subroutines also changed.
 
-4.  Change names of Riemann solvers (rpn2 -> geoclaw_rpn2; rpt2 -> geoclaw_rpt2)
 
-5.  geoclaw_step2.f : Added code to handle cubed-sphere (three corners)
 
-6.  geoclaw_setaux.f : do not do optimzation that avoids extra copying, i.e.
-    Skip this :
-    !! ### parameter NEEDS_TO_BE_SET initialized in amr_module.f90
-    !! ### saves time by otherwise copying instead of reinitializing
-    #if 0
-        IF (aux(1,ii,jj) .NE. NEEDS_TO_BE_SET) THEN
-           skipcount = skipcount + 1
-           CYCLE  ! new system copies bathy where possible
-        ENDIF
-    #endif
 
-7.  Added 'types.h' file which contains definitions of F90 types used
-    in GeoClaw.  These are useful for debugging in GDB.
 
-8.  File 'geoclaw_tag4refinement.f90' replaces 'flag2refine.f90'.
 
-# -----------------
-# Questions
-# -----------------
 
-1.  Does GeoClaw use 'auxtype'?  It is allocated and assigned in amr2.f90, but I don't see it used.
 
-2.  How do we handle the fact that AMR levels start at 1, and
-    ForestClaw levels start at 0?  This comes up for xample, in setting
-    regions.

src/solvers/fc3d_clawpack46/README

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+Notes on the Clawpack 3d solver: 
+
+FORTRAN code and files for the ForestClaw CLAWPACK solver extension were 
+taken originally from the open source project Clawpack: 
+
+    Clawpack Copyright (c) 1994-2025 Clawpack Developers, BSD license: 
+
+         https://github.com/clawpack/clawpack/blob/master/LICENSE
+
+
+Also see http://www.clawpack.org
+
+
+Some of the Clawpack files used here have been modified to suit purposes 
+in ForestClaw. 
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