new copyright; att/bsd/shared

const is an ANSI C keyword

Still more hacking with GOTOs and loops! What a mess. This time we
complete the illusion that adjacent loops are actually embedded loops.
Without this hack, variables which are in one loop but not

Still more hacking with GOTOs and loops! What a mess. This time we
complete the illusion that adjacent loops are actually embedded loops.
Without this hack, variables which are in one loop but not in another
adjacent loop cause severe confusion. A routine varloopset() is added
to re-implement the loopset hack; I'm not certain that this is really
needed at all, now.

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(1) Fix bugs with GOTOs from an inner loop into an outer loop.
(2) Pick up redundant register moves when address registers (STGPREG) are
involved.

Added a fix for a bug that allowed character variables which were
arguments to subroutines to be made eligible to be register variables.

fix problem of trying to put a short into a register from (donn@utah-cs)

4.3BSD beta release version