Query should 'find' connector types and jars rather than have them predefined in the config.

Currently, dqp as delived with Designer is preconfigured with connector types. I think it should discover the connectors that are available upon startup. This would make it easier to add connectors to a kit. The current process for adding a connector to a kit is manual and error prone. We have problems with it on nearly every release.

This is also an attractive feature for embedding query in other environments.