Util: Attempt to clean function scope and unused fields.
SQLite: Fixing sqlutil functions. Scope revision (Table, Source, Tx, Result should not be exported), mild golint review (unused/uncommented globals).
QL: Upgrading QL to meet latest sqlutil fixes.
QL: Mild golint review.
Util: Fixing formatting error while printing QL's error messages.
SQLite: make() invocation was incorrect.
QL: Adding (commented) test for raw SQL.
MySQL: Upgrading MySQL to meet latest sqlutil fixes.
MySQL: Upgrading MySQL to meet latest sqlutil fixes.
PostgreSQL: Fixing some golint issues.
MongoDB: Removing unused struct fields.
Fixing call of Collection() from multiple sources.
PostgreSQL: Automatic discovery of primary key #24.
Fixing Count() inconsistencies, main test passes again.