I have just upgrade to version 4 but I don't understand well how to do about template. In fact I use a customized "portal" template where I have make a lot modification...Now I see new portal template are totally different and I see also some change are made in some template file as describe on wiki upgrade step here
So how I must make my upgrade ? I would like continue to use my old customized portal template.... I start to make some confusion with my template, new portal template and modified template file.... I imagine the list of modified template files are not only modified for graphical reason but also because it contain new code ??