[Reviewer: Jim] Improve compression rate by up to 50% (with dictionary)

Jim,

Please can you approve my changes to the SAS compression settings?  These match those we've used in other products to achieve better performance and my tests on (non-trivial) dictionaries have shown improvements of up to 50% with Clearwater.

I've live-tested.  I don't expect you to review this too thoroughly, but didn't want to check into sas-client without your approval.

Cheers,

Matt