[FIX] bitwiseAnd

[Sean Shao]

I'll update the library later on, but here's the fix to bitwiseAnd (thanks 
MisterX and kWeed.. How come more of you people aren't on Chatrev?)

function bitwiseAnd p1, p2
  if (abs(p1) = 0) OR (abs(p2) = 0) then return 0
  if (p1 < 0) then put (bitNot abs(p1)) + 1 into p1
  if (p2 < 0) then put (bitNot abs(p2)) + 1 into p2
  if p1 > 4294967295 then return (p1 MOD 4294967295) bitAnd p2
  return p1 bitAnd p2
end bitwiseAnd

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