Remove raw field in data event object

[dnlup]

Keeping this field is starting to be cumbersome. Once the set of options for the event loop delay gives the user enough flexibility I think it should be removed.

[dnlup]

Or, I could add an option to select if the user would like the raw metrics or the computed ones. I'm thinking one would use the computed metrics when monitoring an application in production, and the raw metrics when writing a performance analysis tool.