Add a pass transforming Python-style properties in cdef class into Cython-style properties

This makes properties work properly in cdef classes, and gives them the
exact same AST as the “property something:” blocks, whose syntax should
probably be deprecated now.

Fixes T264.

Normalize filenames when calling parse_dependencies()

Conflicts:
	CHANGES.rst

Add missing decorators.

Fix typo.

Cpp copy added to libcpp/algorithm.pxd

Merge upstream

Fix typos.

s/compatability/compatibility/g

fix cascaded assignments to buffer indices: forgot to reassign the analysed (and potentially replaced) node in the tree

These would (and should) probably be inlined regardless.