Operator re-naming

Available prefix chars:

%
^
!
?
`
& (unless we use it for "locative of" and/or "run in background")
$ (in some contexts)

Complex ops:
C is one of the above:

x C+ y	x+1i*y
x C- y	x-1i*y
C+ x	Conjugate
C| x	Abs/magnitude
x C* y	x * exp(1i*y)

Boolean/set ops.
B is a prefix char: (perhaps ?)

x B+ y	Boolean (bit-wise) or
x B* y	Boolean (bit-wise) and
B- y	1-y (Bitsize negate)
x B^ y	?Shift x by y  (x * 2**y) Maybe B<
x Bn y	?Bool operator n (n >= 0; n < 16)  Maybe: x B:n y

Array ops:

q A< n	drop n
q A> n  take n
q A# n or q A? n  Size
