Add explicit schema mapping to all domain classes
Mark some columns as having 'text' data type

The reverse engineer plugin does not add any maxSize constraint to
postgres columns that have type 'text'. As a result, they're mapped to
varchar(255) columns. In postgres, 'text' columns actually support much
more data. Resolve by adding explicit mappings in QtQueryMaster to the
relevant columns (type: 'text').
Add some logging statements
Change query to be H2 compatible
Change strategy to prepare H2 test database

Instead of inlining the necessary statements in the jdbc connection
string, the jdbc connection string now points to an SQL script for H2 to
run. This script is h2_init.sql, in the root of the project.