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/*
   Parallel Sweeping Preconditioner (PSP): a distributed-memory implementation 
   of a sweeping preconditioner for 3d Helmholtz equations.

   Copyright (C) 2011-2012 Jack Poulson, Lexing Ying, and
   The University of Texas at Austin
 
   This program is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.
 
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
 
   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/