added documentation to solver for lim_type=4 (polynomial)

Author: sanromd

src/pyclaw/sharpclaw/solver.py

@@ -42,13 +42,14 @@ class SharpClawSolver(Solver):
             - 0: No limiting.
             - 1: TVD reconstruction.
             - 2: WENO reconstruction.
+            - 3: 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
@@ -208,6 +209,9 @@ def setup(self,solution):
         if self.lim_type == 2:
             self.num_ghost = (self.reconstruction_order+1)/2
 
+        if self.lim_type == 3:
+            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.')