New Dstat developments

With the opportunity to talk at the first Japan Linux Symposium came renewed interest to look at what improvements I could make to Dstat that would be worthwhile to get more people involved.

Dstat doesn't lack users, it lacks system engineers writing interesting plugins for cases they have encountered. In a desperate ploy to get more contributors, I simplified some of the internals (functions, variables and object methods). So the upcoming Dstat 0.7.0 release will ship with a (not so) different plugin API that I hope is easier.