Start of Minister of Supplies.
Rename City_specialization (and related stuff) to City_role.  Brevity is the soul of avoiding obnoxiously long lines.
Comment.
Fix some compile-time errors.
Add a vector of available City_roles to Map_type_datum.
Check if we meet the required morale in Player_city::get_chance_to_birth().  If not, we lose up to 80% chance!  In Player_city::set_tax_rate(), add 20 to Citizen::tax_morale (so it's not always negative).
Merge branch 'master' of github.com:Whales/SimpleEdi