ENH: Add optional level argument to set_names(), set_levels() and set_labels() (GH7792)
WIP: Index no longer an ndarray sub-class (GH5080)
CLN: add searchsorted to core/base (GH6712, GH7447, GH6469)
fixed groupby/resample
fixes in frame/multiindex
more fixes in frame getitem/setitem
hopefully fix identity
re pickle compat
addtl pickle compat
completely changed pickle compat
FIXED PICKLE!!!!!!