neighbors numpy1.3 compat: fix typedefs, regen with cython 0.19
numpy 1.3 compat: use explicit type definitions
numpy 1.3 compat: make neighbors/dist_metrics compatible
COMPAT: empty_like does not have a dtype in np 1.3
COMPAT: make NeighborsHeap compatible with numpy 1.3
COMPAT: make NodeHeap compatible with numpy 1.3
COMPAT: make BinaryTree class compatible with numpy 1.3
COMPAT: make BallTree & KDTree compatible with numpy 1.3
COMPAT: last few BallTree/KDTree numpy 1.3 issues
COMPAT: fix arpack and pls on old scipy/numpy
COMPAT: string formatting syntax in Py 2.6
COMPAT: median and nans in old numpys