Added new version of the tutorial with supplementary exercises for the hungry wolves

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/adegenet@1174 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
updated main figure for 1.4-1

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/adegenet@1175 edb9625f-4e0d-4859-8d74-9fd3b1da38cb