redmine#3034: Increase precision of the final outcome report by 2 decimal places.

I can hardly take much credit for this but found it scouraging redmine, [#3034](https://dev.cfengine.com/issues/3034). Please consider backporting the change.

Final outcome now reads as:
```
2014-05-16T08:18:51-0500  verbose: Logging total compliance, total 'Outcome of version CFEngine Promises.cf 3.7.0 (agent-0): Promises observed to be kept 95.97%, Promises repaired 4.03%, Promises not repaired 0.00%'
```