Allow explicit "-2" option for the cythonize script to set the language level to 2 (the current, but not future, default).

Remove docs note about fused types being "experimental". They are old enough by now to consider them an established language feature.

Avoid depending on some C macros in the buildenv.pyx test that might not be defined (specifically on MSVC, as usual).

Added basic ctuple documentation.

Extend "buildenv" test to show more information about the build system, including the distutils configuration.

Closes #2567.

Fix overflow.fold being available on most directives in pure python mode

Add export of the bytearray cpython api

Fix usage of special name "sizeof" in a test: cannot be assigned to a variable because it is not an actual function.

This lambda is assigned to multiple names, so the fold attribute would be copied to all those names.

See #2559.

Set the maximum line length to 150.

Corrected broken URL of the notebook.

ignored the build of the docs in git.

Changed the numpy tutorial to make is faster to understand.