Better message in exception when conversion from period to timestamp fails
CLN: Remove core/array.py
Allow importing pandas without setuptools
BENCH: programmatically create benchmarks for large ngroups (GH6787)
DOC: fixup categorical news
DOC: update cut/qcut docstrings

* add some clarification about the useage of bins/labels and that they
  end up as categories.
* Update the examples to produce the current output with the new
  categoricals.
FIX: add nbytes property in Categorical
Merge pull request #8406 from sh9189/bbopensrcday2

CLN: Remove core/array.py
Merge pull request #8409 from jacobschaer/issue-8107

Allow importing pandas without setuptools
Fixup 10min
Merge pull request #8414 from JanSchulz/nbytes_categories

FIX: add nbytes property in Categorical
BUG: Bug in interesection of non-monotonic non-unique indexes (GH8362)
API/BUG: a  timeseries/index localized to UTC when inserted into a Series/DataFrame will preserve the UTC timezone (rather than being a naive datetime64[ns]) as object dtype (GH8411)
Merge pull request #8405 from sh9189/bbopensrcday

Better message in exception when conversion from period to timestamp fai...
BUG: apply Series mask to aligned new values (GH8387)
Moved startup script information to options docs and fixed link based on GH8407 and GH5748
Doc: Add Categorical to R comparison

Also fix all omited `pd.`
FIX: Add Categorical.searchsorted stub

For https://github.com/pydata/pandas/pull/7447, add a searchsorted
stub, which simple raises NotImplementedError, so taht we raise a
more clear error than attribute not found.
Fix VECTOR_TYPES and NA_TYPES dicts used for pd DataFrame <-> R data.frame conversion

added commas to dict

string_ not string

changed parse_version to LooseVersion

Updated release notes
Merge pull request #8421 from JanSchulz/cat_searchsorted

FIX: Add Categorical.searchsorted stub