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avr.path.astar - A* path finding module.

Path finding in a user provided graph.  One of the main idea behind this
module is to be able to operate with a minimum memory footprint even with a
large number of nodes.

This can be useful with a grid based graph, where there is many nodes, but not
so many arcs, and arc weight (which are not stored by this module) can be
computed quickly.

This module use an indexed nodes storage, therefore, memory consumption is
O(n), with n the number of nodes.  For very large grids, another
implementation could be done where unused nodes are not stored in memory.


Copyright (C) 2010 Nicolas Schodet

APBTeam:
       Web: http://apbteam.org/
     Email: team AT apbteam DOT org

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 2 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, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.