Add wheelhouse directories to gitignore.

Disable refnanny in PyPy since it otherwise risks to access partly initialised objects, e.g. tuples.

Fix reference leak in the Py2.x __Pyx_ReleaseBuffer() implementation for types with an overridden __releasebuffer__ method.

Closes #1638.

This fixes #1788.

This fixes #1790.

Closes #1791.

Closes #1806.

implement len(cython.view.array) as it seems weird that it is supported for memoryviews but not the array type

Fix a compiler crash when looking up cython.view.array() as a callable function with non-trivial keyword arguments.

Closes #1598.

Closes #1801

Remove a macro from helper code that I find difficult to read. The result is not perfect, but at least it's more visible what get's assigned to what.