Fix an incorrect field name reference
Add test-cases for main stable page
Consistent case for stable owner field
Use a Through table for Pilot Skills so that additional details can be
kept stored when needed (e.g. for Weapon Expert)
Add a new table / class for keeping track of Houses
Consolidate migrations / fix an error concerning the same constraint
being added twice.
Rename tech-tree export to make room for other related exports
Add export of pilot skills data listing
Fix the Login Failed error in the login form.