Copyright 2012, 2013, 2014, 2015 Kevin Ryde

This file is part of Math-PlanePath-Toothpick.

Math-PlanePath-Toothpick 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, or (at your option)
any later version.

Math-PlanePath-Toothpick 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 Math-PlanePath-Toothpick.  If not, see <http://www.gnu.org/licenses/>.



Version 18, October 2015
    - ToothpickSpiral new turn_any_straight()

Version 17, May 2015
    - LCornerReplicate fix for level methods

Version 16, February 2015
    - ToothpickTree fix for n_to_level()

Version 15, September 2014
    - new methods n_to_level(), level_to_n_range()

Version 14, June 2014
    - new methods x_negative_at_n(), y_negative_at_n()

Version 13, December 2013
    - new HTree

Version 12, October 2013
    - new sumabsxy_minimum()

Version 12, July 2013
    - new tree_n_to_subheight()

Version 11, June 2013
    - ToothpickTree new parts=two_horiz
    - new tree_num_children_list()

Version 10, May 2013
    - new ToothpickSpiral

Version 9, May 2013
    - LCornerTree new parts=octant+1, octant_up+1, wedge+1

Version 8, May 2013
    - ToothpickReplicate fix parameter_info_array() choices only 4,3,2,1

Version 7, May 2013
    - LCornerTree new parts=diagonal,diagonal-1

Version 6, April 2013
    - new sumxy_minimum(),sumxy_maximum(), diffxy_minimum(),diffxy_maximum(),
    - ToothpickTree new parts=octant,octant_up,wedge

Version 5, April 2013
    - LCornerTree,OneOfEight new parts=octant_up,wedge

Version 4, April 2013
    - new dir_maximum_dxdy()
    - LCornerTree new parts=octant
    - Math::NumSeq::OEIS catalogue entries for OneOfEight

Version 3, February 2013
    - new OneOfEight

Version 2, January 2013
    - new tree_num_children_maximum()

Version 1, December 2012
    - the first version, ToothpickTree,ToothpickReplicate, ToothpickUpist,
       LCornerTree,LCornerReplicate,