Big changes:
1) #p4graph parser function that generates GraphViz output (need the
GraphViz plugin to see the graph on the page, or copy and paste the
output into a GraphVis renderer)
2) Special:Perforce page (so that you can link to a graph on a separate
page rather than embedding it)
3) #p4info parser function (mostly to provide content for
Special:Perforce)
There should also now be a change number embedded in the credits entry
so you can see what version of the plugin you have installed.