added documentation to solver for lim_type=4 (polynomial)

Author: sanromd

src/pyclaw/sharpclaw/solver.py

@@ -55,11 +55,14 @@ def before_step(solver,solution)
         0: No limiting.
         1: TVD reconstruction.
         2: WENO reconstruction.
+        3: WENO5 reconstruction.
+        4: Polynomial reconstruction.
         ``Default = 2``
 
     .. attribute:: reconstruction_order
 
-        Order of the WENO reconstruction. From 1st to 17th order (PyWENO)
+        Order of the reconstruction. From 1st to 17th order (PyWENO), and from
+        4 to 10 (even) in Poly
         ``Default = 5``
 
     .. attribute:: time_integrator
@@ -207,6 +210,9 @@ def setup(self,solution):
         if self.lim_type == 2:
             self.num_ghost = (self.reconstruction_order+1)/2
 
+        if self.lim_type == 4:
+            self.num_ghost = 1 + self.reconstruction_order/2
+
         if self.lim_type == 2 and self.reconstruction_order != 5 and self.kernel_language == 'Python':
             raise Exception('Only 5th-order WENO reconstruction is implemented in Python kernels. \
                              Use Fortran for higher-order WENO.')