Clover html reports don't wipe previous reports/html files

When running <clover-report/> in html format, it does not clear the previous report's html files. This is a problem when running multiple builds over time because the report directory continuously grows and grows.

And then, this can be an issue when tied into Bamboo, due to how Bamboo stores it's artifacts (copies the entire report directory over to the server).

Although it's easy to work around this by deleting the clover-report/current directory before a new build, it would be nice if this limitation was mentioned in the documentation OR the functionality of deleting the previous report was added to either the <clover-clean/> target or to the <clover-report/> target.