Message 247558 - Python tracker

Patch v3:

* Merged with recent changes
* New glossary entry for “contiguous”, with incoming links from various points
* Removed my definition from buffer.rst

I found the Num Py explanation a bit brief, assuming what you quoted was the extent of it. I used some of that wording, and added a bit more, although it is still not a complete definition. Let me know if you think this version is acceptable.