New documentation: migrating from other popular SCM systems

Just a quick note to let you know that the main product documentation page on our Web site includes a new category, "Migrating from other SCMs". It contains writeups on migrating to Plastic SCM from these well-known systems: Microsoft Visual SourceSafe (VSS), CVS, Subversion, and Perforce.

These writeups are not "marketing fluff" -- they are technical discussions, aimed at helping users who are transitioning to Plastic SCM (or just thinking about such a transition!). We welcome all comments on these migration documents.