PERF: Performance improvement for MultiIndexes with a DatetimeIndex level
DOC: Clean Cookbook Issues: Tabs, expanded_apply, axis aliasing, etc.
Merge pull request #8535 from jnmclarty/cookbook_inline_examples

DOC: Clean up Sphinx Issues, fix tabs, in Cookbook
Merge pull request #8544 from mtkni/master

PERF: Performance improvement for MultiIndexes with a DatetimeIndex levels
* khash.h: move custom hash map definitions into khash_python.h

* khash_python.h: make pyobject_cmp static to avoid public symbol clashes

* khash_python.h: add include-guard
khash.pxd: remove kh_del

kh_del is broken after removing isdel flag, ensure it's never called by
deleting it altogether.
khash.h: sync with 0.2.8 upstream release
Add factorization vb suite