#6 Garbage collection between laps

[Javier Godoy]

Garbage Collector should be invoked before each lap, in order to reduce the noise of objects from the previous lap being collected in another lap.

I placed an invokation to System.gc(); just before watch.start() on line 144 of Circuit class.

Though GC cannot be forced, this suggest the VM to do its best effort on collecting garbage. I think this invocation is a good idea because othewise I could (in theory) penalize some database because several objects were created for another database.

One could also argue that GC should be requested between the watch calls.