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+ Enable the building of wheels for the project now that Cython extensions
are used. Thanks to marcelm for providing a working build script on
https://github.com/marcelm/dnaio.
+ Cythonize the splitting algorithm. This reduces the overhead of the application
up to 50% over the fastest native python implementation. Overhead is all the
allocated cpu time that is not system time.
This means splitting of uncompressed fastqs will be noticably faster
(30% faster was achieved during testing). When splitting compressed
fastq files into compressed split fastq files this change will not be much faster
since all the gzip process will be run in a separate thread. Still when splitting
a 2.3 gb gzipped fastq file into 3 gzipped split fastq files the speedup from
the fastest python implementation was 14% in total cpu seconds. (Due to the
multithreaded nature of the application wall clock time was reduced by only 3%).