Headers cleanup and removal where suitable

OK tb@

Remove the advertising clause in the UCB license which Berkeley
rescinded 22 July 1999. Proofed by myself and Theo.

Tidy the code, follow the rules more closely (and document where we diverge),
and make save files work. The last stops a number of segfaults.

rand -> random; handle EOF; don't overflow on user input; check for calloc()
success; OpenBSD tags; some reformatting and ridding of unused variables.

Store the card deck using fixed sizes and network byte order

initial import of NetBSD tree