detrend() now has a 'return.info' argument like detrend.series()


git-svn-id: svn://svn.r-forge.r-project.org/svnroot/dplr@829 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
* made an xskel.plot function to go with xskel.ccf.plot
* fussed with the colors a bit in ccf.series.rwl

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/dplr@830 edb9625f-4e0d-4859-8d74-9fd3b1da38cb