Move all content to subfolder sqltutor-web.
Add IRIS setup script and files.
Create sqltutor-parent POM project.
Create sqltutor-common base module and move some code there.
Separate NLP code into sqltutor-nlp.
Account for IRIS parent POM in install helper.
Set explicit compiler version in parent POM.
Fix slf4j version.
Disable defunct repositories in IRIS' POM.
Temporarily move ER diagrams into main NLP module so webapp can
see them.
Update database export.
Convert web app to Maven project, initial attempt.