fixed accession numbers in usflu

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/adegenet@1187 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
updated lecture intro MVA

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/adegenet@1188 edb9625f-4e0d-4859-8d74-9fd3b1da38cb