Updates to dragonfly network model: updated reverse computation code and other fixes

git-svn-id: https://subversion.cs.rpi.edu/svn/rossnet/trunk@677 2481c9be-fdbf-de11-a427-00b0d041e3d9
Updates to torus model, bandwidth calculation added

git-svn-id: https://subversion.cs.rpi.edu/svn/rossnet/trunk@678 2481c9be-fdbf-de11-a427-00b0d041e3d9
Merge remote-tracking branch 'upstream'