numpy arrays are no longer omitted from locals()

Improve "missing cimport" message

Fix errors in example code sections in documentation.

Fix a typo in a comment

Fix mangling for C++ namespaced types

+ setup.py instructions for Visual C++ compiler

Add setup.py openMP instructions for Microsoft Visual C++ compiler

"ustring!s" (i.e. str(ustring)) is actually not safe to optimise away for f-string formatting in Py2 as it can fail to encode the Unicode string to a byte string. And it's unlikely to appear in practice.

Fix timestamps option to work when generating a C++ output file.

writing output file to a specified location.

by making BufferType coercable to pyobject

also adds illustrative testcase

This posed an issue when the type parameter was a typedef.

Implemented Smith's method, which avoid overflow for all but
the most extreme exponents. This agrees with what is used in NumPy.