#141 0^i is 0, should be undefined

v1.0 (example)
open
nobody
None
4
2013-07-12
2013-07-12
Cousteau
No

0^i (zero to the power of the imaginary unit) is currently evaluated as 0. Theoretically, this result is indeterminate (the argument doesn't converge and the modulus depends on how you approach 0). Qalculate! should warn about this and yield undefined.
(This is not very important; it's not like you calculate 0^i everyday; but since Qalculate! warns you when you calculate 0^0, something many programs just assume to be 1, it would make sense that it did here too)

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