bw2speedups 2.3

Cython functions to speed up Brightway2 LCA calculations

# Brightway2 speedups

A series of function written in [Cython](http://cython.org/) that speed up critical functions to improve the overall performance of the [Brightway2 life cycle assessment framework](https://brightwaylca.org).

In order to avoid having to have Cython as a dependency, this library includes both the pyx and Cython-generated c code, and is distributed as pre-compiled [wheels](https://pypi.python.org/pypi/wheel), except on Linux where access to a C compiler is assumed.

## Building C files

cython -t bw2speedups/_consolidate.pyx bw2speedups/_indexer.pyx bw2speedups/_find_first.pyx

## Building shared libraries

Although you can do this inplace, in my experience it is easier to just install the library in a temporary environment. You don’t want to deal with .so files in the source repository.

## Testing

Install the library into a temporary environment, then manually run the separate test files, i.e. python bw2speedupds/test/test_consolidate.py. This isn’t the most elegant, but it will do for now.

## Building wheels

pip install wheel python setup.py bdist_wheel

Note that this has to be done separately for each OS and environment, i.e. Windows 32-bit and 64-bit versions of Python are separate wheels, even with the same version of Windows.