(have_looked,have_found,set_have_looked,set_have_found,print_found):

(have_looked,have_found,set_have_looked,set_have_found,print_found):
collapse to shiplist function set (add,free,print,on). Fix bug where ship
uid was a unsigned char instead of short.  Switch to head pointer instead
of head record with a linked list. Add a free().