Make possible to see instrumented sources in Clover-for-Eclipse

Clover-for-Eclipse: Clover instrumentation in performed in memory during compilation. As a consequence when there is any build error, we can see original source only and cannot check whether the problem lies in the Clover instrumenter itself.

For example, in Clover-for-IDEA we can see instrumented sources because they're stored in temporary directory.

To be implemented: add an option to get instrumented sources in Eclipse too.