Repaires system petsc bug I introduced

Solver/linearSystemPETSc.cpp

@@ -206,10 +206,8 @@ int linearSystemPETScBlockDouble::systemSolve()
     KSPSetOperators(_ksp, _a, _a, SAME_NONZERO_PATTERN);
   else
     KSPSetOperators(_ksp, _a, _a, DIFFERENT_NONZERO_PATTERN);
-  if (_matrixModified && _parameters["matrix_reuse"]!="same_matrix"){
-    MatAssemblyBegin(_a, MAT_FINAL_ASSEMBLY);
-    MatAssemblyEnd(_a, MAT_FINAL_ASSEMBLY);
-  }
+  MatAssemblyBegin(_a, MAT_FINAL_ASSEMBLY);
+  MatAssemblyEnd(_a, MAT_FINAL_ASSEMBLY);
   _matrixModified=false;
   VecAssemblyBegin(_b);
   VecAssemblyEnd(_b);

Solver/linearSystemPETSc.hpp

@@ -280,10 +280,8 @@ int linearSystemPETSc<scalar>::systemSolve()
     _try(KSPSetOperators(_ksp, _a, _a, SAME_NONZERO_PATTERN));
   else
     _try(KSPSetOperators(_ksp, _a, _a, DIFFERENT_NONZERO_PATTERN));
-  if (_matrixModified && linearSystem<scalar>::_parameters["matrix_reuse"]!="same_matrix"){
-    _try(MatAssemblyBegin(_a, MAT_FINAL_ASSEMBLY));
-    _try(MatAssemblyEnd(_a, MAT_FINAL_ASSEMBLY));
-  }
+  _try(MatAssemblyBegin(_a, MAT_FINAL_ASSEMBLY));
+  _try(MatAssemblyEnd(_a, MAT_FINAL_ASSEMBLY));
   _matrixModified=false;
   /*MatInfo info;
     MatGetInfo(_a, MAT_LOCAL, &info);