parametric (marginal) survival models

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/lava@1066 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
added model.frame method. Added id variable to return list. Fixed problem with data processing with factor id (model.matrix was called?)

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/lava@1067 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
small bug-fix with 'not-varying' argument 'varying=-vector'

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/lava@1068 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Row+column names in iid.estimate.
Clean-up...

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/lava@1069 edb9625f-4e0d-4859-8d74-9fd3b1da38cb