Unit tests: Add database schema for many older versions
Unit tests: Add missing version table to FB 1.0.5+ schemas
Create installation, migration and upgrade SQL files
Installer: Improve JoomlaBoard/FireBoard/Kunena migration SQL (unused)
Documentation: Add MySQL Workbench file for Kunena database schema
Merge pull request #1287 from mahagr/master

Add database schema files for unit testing, installation, upgrades and documentation