cleanup copyright notices on all files. I have attempted to be accurate with
the details. everything is now under Tatu's licence (which I copied from his
readme), and/or the core-sdi bsd-ish thing

cleanup copyright notices on all files. I have attempted to be accurate with
the details. everything is now under Tatu's licence (which I copied from his
readme), and/or the core-sdi bsd-ish thing for deattack, or various openbsd
developers under a 2-term bsd licence. We're not changing any rules, just
being accurate.

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OpenBSD tag

-pedantic: signed vs. unsigned, void*-arithm, etc

int atomicio -> ssize_t (for alpha). ok deraadt@

move atomicio into it's own file. wrap all socket write()s which were doing
write(sock, buf, len) != len, with atomicio() calls.