Tiny cythonizing tweaks
Tiny cythonizing tweaks

instead of
	(lookup[i]).attribute = foo
	which means the attribute is set via a
python call, we do
	vertex = lookup[i]
	vertex.attribute = foo
and let cython know that vertex is an Atom

chatelak/RMG-Py,nyee/RMG-Py,pierrelb/RMG-Py,nickvandewiele/RMG-Py,comocheng/RMG-Py,nickvandewiele/RMG-Py,comocheng/RMG-Py,enochd/RMG-Py,enochd/RMG-Py,pierrelb/RMG-Py,nyee/RMG-Py,KEHANG/RMG-Py,faribas/RMG-Py,KEHANG/RMG-Py,chatelak/RMG-Py,faribas/RMG-Py