work on ship ai
work on fleet stuff
more fleet stuff
add square fleet position code
more stuff to fleet code

fleet_count()
fleet_leave()
fleet_join()
fleet_position_number()
fleet_get_leader_id()
Add fleet test code
add test code for square fleets
more ai code
factor out ai brain code
add patrol to ai stack
add fleet leader to ai stack
increase number of ships
make fleets drive not so straight
leave fleet on dying
Select fleet shape randomly
add fleet_member_get_id function
add fleet_members function
make fleets react more as a unit than as a bunch of individuals
always set dox,doy,doz when entering attack mode

(whether directory or by popping the ai stack)
factor out push_attack_mode function