Also update some previous inconsistencies pointed out by Krinkle in change IDs:
* Ide20743a2e84ff68549286120e6cff9d9f396f54
* I811ca957b6588085d67606ebc0cd4033a1e53839
Change-Id: Ife33b931870d0d7e04fcb40974997436d27f528f
Greatly simplifies query result iteration by the clients
by providing a mechanism to track sub-iterations (props in generated set)
Assuming the client has the param=>value dictionary with the original request
parameters, client will only need to perform this operation in their language
to get all results from the server regardless of what query they make.
$request = array_merge( $request, $result['continue'] );
Related changes:
* Moved dieContinueUsageIf() from ApiQueryBase to ApiBase
* Internal calls will also return unused param warnings
* Reworked query unit tests for easier testing
Change-Id: Ieb45241fc6db2109f1d92fa3381165ec30701b63
