SF project created, version 4 uploaded

I've finally gotten around to creating a sourceforge project for PMASK... this will take over as the primary download / web site for PMASK. Version 4 is now up, I'll clean up version 5 for release sometime in the next few days. Be aware that with version 5, the higher-level portions of pmask have split off into a seperate library, which has its own project page at http://sourceforge.net/projects/collist/ though I haven't done the release for that one yet.