second half of the few/many change

[belltower] / TODO

* Window name on tower pick lists
* Areas of the world with many/few towers
* Sharp and flat signs
* Add my name to the credits list
* Switch names in the buttons in the credits list around ("view..." should be subtext)
* Download Dove automatically
* parse_dove should have an option to call show_towers_by_list automagically (maybe if you include a title)