Reduce scope of manifest #351
Description
Our manifest is including too many large files, and the resulting sdist files are not admissible to PyPI by default. While it is my personal taste that the source distribution being complete (ie what you would get from git), it is not necessary, and in this project's case would require special exceptions from PyPI for size constraints.
I'm going to put together a small PR that removes tests and tutorials from the sdist. It's come to light that may have been the original intention, though it was never implemented that way.