starting values altered. NR fixed

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/lava@1021 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
iid method added for multigroupfit

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/lava@1022 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
doc...

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/lava@1023 edb9625f-4e0d-4859-8d74-9fd3b1da38cb