[evol] updated schema
[cosmetic] artwork_sizes height and width are now integers in the DB, and displayed with the corresponding unit (closes #14)
[evol] use SQL sessions instead of cookies-based ones
[fix] forgot to sync db dump
[fix] db schema sync (multiple materials and no id field for simple HABTM (or fetching remote object ids would fail))
[fix] renamed 'technique' into more appropriate name 'artwork_support', and update schema and translations (Closes #4)
[evol] created a simple logon system, protected admin pages, and added a logon indicator/link (no user management yet, only a deadend entry in the menu if admin)
[evol] update schema
Initial version