Changed how voided statements are returned

Summary of changes:
* The LRS now does not return voided statements unless asked for them by statementId.
* The LRS still returns the voiding statement that references a voided statement matched by the query (thus giving the reporting tool the statementId if it still wants to get the voided statement, and helping propagation of voiding statements).
* Removed references to the voided flag in the Voiding section.