Update NEWS, docs, and patchlevel for 3.7.0b1

Include/patchlevel.h

Lib/pydoc_data/topics.py

Misc/NEWS.d/3.7.0b1.rst

...EWS.d/next/Build/2018-01-16-08-32-49.bpo-29708.YCaHEx.rst

...EWS.d/next/Build/2018-01-18-11-10-52.bpo-32593.XIrf3v.rst

...EWS.d/next/Build/2018-01-19-14-50-19.bpo-32598.hP7bMV.rst

...EWS.d/next/Build/2018-01-23-15-33-40.bpo-32635.qHwIZy.rst

...EWS.d/next/C API/2017-12-28-15-22-05.bpo-10381.a1E6aF.rst

...EWS.d/next/C API/2018-01-26-17-29-29.bpo-32681.N1ruWa.rst

...ore and Builtins/2017-08-07-16-46-56.bpo-31113.XgNEFg.rst

...ore and Builtins/2017-08-10-17-32-48.bpo-31179.XcgLYI.rst

...ore and Builtins/2017-11-02-00-34-42.bpo-31356.54Lb8U.rst

...ore and Builtins/2017-12-03-22-29-13.bpo-32028.KC2w4Q.rst

...ore and Builtins/2017-12-04-18-34-11.bpo-20891.C2TsfR.rst

...ore and Builtins/2017-12-13-16-46-23.bpo-18533.Dlk8d7.rst

...ore and Builtins/2017-12-28-00-20-42.bpo-32436.H159Jv.rst

...ore and Builtins/2018-01-01-21-59-31.bpo-24340.hmKBvg.rst

...ore and Builtins/2018-01-06-01-14-53.bpo-20104.9DkKb8.rst

...ore and Builtins/2018-01-14-12-42-17.bpo-32550.k0EK-4.rst

...ore and Builtins/2018-01-14-20-32-47.bpo-26163.xv9Iuv.rst