Issue #19137: The pprint module now correctly formats empty set and frozenset
and instances of set and frozenset subclasses.
Drop buildbottouch again; the master is using "make touch" now.
Issue #19147: Fix docstring for fcntl.flock to refer to correct man section.
Issue #18037: 2to3 now escapes '\u' and '\U' in native strings.
dict is also allowed (closes #19163)
#19166: use an unused var in a test.  Patch by Vajrasky Kok.
#19068: use imperative mood in complex object docstrings.  Patch by Marco Buttu.
#19069: use imperative mood in float object docstrings.  Patch by Marco Buttu.
#19074: mention PySide in the GUI FAQs.
Issue #19171:  speed some cases of 3-argument long pow().

Reduce the base by the modulus when the base is larger than
the modulus.  This can unboundedly speed the "startup costs"
of doing modular exponentiation, particularly in cases where
the base is much larger than the modulus.  Original patch
by Armin Rigo, inspired by https://github.com/pyca/ed25519.
(grafted from f34c59494420765b013136ca93f63b716d9f1d30)
Issue 14927: Minor clean-up of function parameters in random().
Fix "customer timer" -> "custom timer" (reported by Kirk Strauser on docs@)
Fix: Element.text is an attribute, not a method (report by Cameron Laird on docs@)
Remove dead link to effbot Tkinter introduction material (reported by Ralf Ganswindt from docs@)
Fix markup.
Fix markup to not add parens to the "hashlib.md5" constructor when the object is meant, not the call.
Fix prefix_chars not being applied in help text example (reported by John Kooker on docs@)
Clarify docs for os.path.getctime on Unix: it is the inode (metadata) change time
Fix some PEP8 in curses HOWTO.
Fix small copy-paste typo in ossaudiodev setparameters() example (found by Ken Housley on docs@).