Add SecuritySubType support for Derivative SecurityList Request / Derivative Security List

Imported from previous forum

[ original email was from Jim Northey - jnorthey@lasalletech.com ]
Add support for SecuritySubType queries using the Derivative Security List Request / Derivative Security List messages.

[ original email was from Kevin Houstoun - kevin.houstoun@ssmb.com ]
This has been assigned ID [PC20030319_9] and will be discussed by the technical committee.

> Add support for SecuritySubType queries using the Derivative Security List Request / Derivative Security List messages.
>