[Matrix-SIG] More patches for UserArray and Numeric

[Charles G Waldman]

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Below are two more patches against LLNLDistribution11.  The first one, 
for UserArray.py is to be applied on top of the indentation-fixing
patch I recently posted.  This patch fixes some problems with the
typecode method, and allows one to assign directly to the "shape"
attribute, as one can do for Numeric arrays.

The second patch, for Matrix.py, fixes a few errors.  First is that
the __init__ for the base class UserArray is not called.
Additionally,  I now allow square matrices to be raised to positive or 
negative integer or long integer powers.  Of course if the power is
negative and the matrix is non-invertible, an exception is raised.

Patch #2 for UserArray:

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Patch for Matrix.py, implementing M**n:

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