Change trajectories function to work on mcmc and mcmc.list objects, and allow it to be passed an mlwinfitMCMC object directly.

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/r2mlwin@285 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Remove recursive parameter values, and add some default values.

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/r2mlwin@286 edb9625f-4e0d-4859-8d74-9fd3b1da38cb