Review swaps

[Paulo César Pereira de Andrade]

  Hi,

Two  easy reviews. These are required to update to sagemath-6.8.
[I will work to update to sagemath-6.9...]

https://bugzilla.redhat.com/show_bug.cgi?id=1278081
rw - Program that calculates rank-width and rank-decompositions
rw is a program that calculates rank-width and rank-decompositions.
It is based on ideas from "Computing rank-width exactly" by Sang-il Oum,
"Sopra una formula numerica" by Ernesto Pascal, "Generation of a Vector
from the Lexicographical Index" by B.P. Buckles and M. Lybanon and
"Fast additions on masked integers" by Michael D. Adams and David S. Wise.

https://bugzilla.redhat.com/show_bug.cgi?id=1278140
planarity - Implementations of several planarity-related graph algorithms
This code project provides a library for implementing graph algorithms
as well as implementations of several planarity-related graph algorithms.
The origin of this project is the reference implementation for the Edge
Addition Planarity Algorithm, which is now the fastest and simplest
linear-time method for planar graph embedding and planarity obstruction
isolation (i.e. Kuratowski subgraph isolation).

Thanks,
Paulo