Version 0.4.0:
renamed argument init.control to start.control;
renamed argument init to init.method;
introduced argument init.drop;
updated references;
made xreg an independent argument;
introduced bootstrap prediction intervals;
other minor changes


git-svn-id: svn://svn.r-forge.r-project.org/svnroot/tscount@29 edb9625f-4e0d-4859-8d74-9fd3b1da38cb