Begin the planet model test.
Planet model now errors if you try to add two command centers.
Planet model now has a num_aggregate_launchpads_ccs_storages for counting.
UI no longer crashes when Planet model errors upon adding a second command center.
Flesh out more tests.
Complete planet observable tests.
Fix planet failing the name, type, and alias observable tests.
Change PLANET_TYPES from an unnecessary hash to an array.
Update all methods that use PLANET_TYPES.
Change planet type combo box to use cleaner, smaller Gtk::ComboBoxText now that I'm just using strings for types.
Fix crash on planet.abandon
Create tests for planet.abandon.