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Issue: BIT-ARRAY-FUNCTIONS (version 6)

I'd like to suggest an additional change, which seems to be consistent
with the attitude about use of bit vectors expressed in the proposal.
The BIT and SBIT functions should return 0 if asked to access outside
the bit array.  This would maintain the tautology

	(bit (bit-XXX v1 v2) n) == (logXXX (bit v1 n) (bit v2 n))

If slowing down these functions (they'd be the only array accessors
REQUIRED to check the dimensions) is considered unacceptable, then a new
accessor should be added.