Merge branch 'release'
Typo fixed.
More information added to docstring.
More information in dosctring.
More details in docstring.
Added test for the extended unumpy.core.wrap_array_func().
Note: the extension is not used in the code, but is provided because it was
easy to provide.
Merge branch 'master' into master_python2.3

Conflicts:
	uncertainties/unumpy/core.py