Wrote Import function for DatabaseTransferService.

Did not complete unit testing.

Realized that web database schema is insufficient: Because the thick client Sqlite database uses two tables for current and dispensed inventory, while the web database uses a single table for both, this will introduce uniqueness conflicts between the id column of the web database and the TWO id columns of the thick client database.

Next immediate concern is to alter the web schema to account for the two different IDs the thick client uses.