Update help files and minor corrections

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/hmsc@42 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Updated todo list

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/hmsc@43 edb9625f-4e0d-4859-8d74-9fd3b1da38cb