Updated cuss editor.
Actually show map info when hitting Enter in mapview mode.
Function init_all_data() wraps all other data initialization functions.
Map_tile::get_info() actually returns info.  City_map::generate() includes placement of crops and minerals.  Map_tile stores a vector of Mineral_amount (instead of just Mineral).
Mineral_amount::randomize() returns itself with 80-120% of the original amount.  Rename init_crops_and_minerals() to init_crop_and_mineral_data() (for consistency with other init functions).  Remove all traces of corn.
Remove all mention of corn.