[PD-dev] xor binop

[pix]

i thought someone would have done this before, but here is a patch to
include an xor binop [^ ] to pd.

this came up because i really wanted a bitwise not... then i realised that
when you are dealing with floats, logical not doesn't make any sense (it's
not clear how many bits wide the result should be). but then i realised i
could fake a restricted kind of not, by xor-ing against an all-ones mask
which is as wide as i need.

so: "x ^ 255" is like NOT x when 0 <= x <= 255 (which you could always
ensure with an x & 255)

other, more normal uses of xor, i will leave up to your imagination.

included also is a version of the otherbinops.pd help file with the new
operator added.

by the way, i'm adding this as a patch to pd because it's too trivial to
make a new external for, and it should be in pd anyhow.

pix.
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