Added possibility to do .filled.contour() as a raster image in wavelet.plot()

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/dplr@865 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Reduced size of timeseries-dplR.pdf and the whole package with useRaster=TRUE in a wavelet.plot() call

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/dplr@866 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
svn:eol-style native for the new file

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/dplr@867 edb9625f-4e0d-4859-8d74-9fd3b1da38cb