synopsis: INT add_vector(OP a,b,c)
description:a,b should be VECTOR objects, c should be a empty object. The routine computes c = a+b. The addition is componentwise, and it also works if the vectors have different length. a,b,c must all be different
return:OK, or ERROR
bug:there is no check on typs, because this is a special routine, normally you should use add instead.
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