In BaseContextSenstiveTest, separate out manual setting of auto-increment on Concept Table from initializing database with test data

Within BaseContextSensitiveTest, there is a method "initializeInMemoryDatabase" which initializes the in-memory database with some test data.

This method also manually alters the concept table to so that concept_id is automatically incremented... this is necessary because Concept uses a custom identity generator.

In some cases, developers may want to write tests that do NOT initialize the in-memory database with test data, but do want to properly set up the Concept table (and any other tables that might use a custom identity generator in the future).

To do this, that part of the code should be broken out into a separate public method.