Add information such as line number or source code in VerifierComponent

We can link the VerifierComponent with their descriptions.
This provides a simple access to information from the descriptions of the component or its associated VerifierMessageBase.

I tested this by adding to the VerifierComponent constructor the BaseDescr :
public abstract class VerifierComponent implements Comparable<VerifierComponent>, Cause {
private BaseDescr descr;
public VerifierComponent(BaseDescr descr)

...
}

And integrate that in all Visitors.
This seems to work. ( https://github.com/jerr/drools/tree/line-number-in-verifier )

What do you think of this, I can add test cases and provide a patch or git pull request.