matplotlib Code

Backport memory leak fixes in _ttconv.cpp

fix typo

add some more text

added backend_fallback to traited config

bumbed release number

Fix image maps in inheritance diagrams.

Remove warnings in _delaunay.cpp and consolidate duplicate cleanup code (so it doesn't have to be manually kept in sync).

use 'import numpy as np'

Fix memory leaks in ttconv (that manifest themselves in the PDF and PS backends).

Don't use fancy Unicode on a narrow Python build.