* Updates the database-import feature to a basically functional state.
* Adds a "service" tier in between the "controller" and the "domain" objects tier.
* Introduces DTO's, and converters between DTO and domain objects.
* Configures the H2 database for PostgreSQL compatibility mode.
* Changes the database type for UUID keys from "BINARY(16)" to "BYTEA" for PostgreSQL compatibility.
* Configures JPA to not create/alter the database schema when running in production mode.
* Fixes a few Thymeleaf bugs in the user home page... so that all users are available for selection, and the page will reload properly when a user is selected.