[PYTHON MATRIX-SIG] Type coercion two more times

[Hinsen Konrad]

   Ok, I'm starting to be convinced. My last hurdle to saying yes is
   having to explain the following to potential Python array users:
   >>> pi = omath.arctan(1.0)*4.0
   >>> m = Array_f([1.0,2.0,3.0])
   >>> m * pi
   Traceback (innermost last):
     File "<stdin>", line 1, in ?
   TypeError: inconsistant floating point types

It could be made a bit easier by changing the text of the
error message:
   TypeError: no automatic coercion between precisions

Yet I agree, this is not a desirable feature. It is just the most
acceptable among the evils we have to choose from.

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Konrad Hinsen                     | E-Mail: hinsenk@ere.umontreal.ca
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