Auto backport of pr 27580 on 0.25.x#27690

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jreback wants to merge 8 commits intopandas-dev:masterfrom

jreback:auto-backport-of-pr-27580-on-0.25.x

Commits on Jul 24, 2019

Backport PR #27510 on branch 0.25.x (BUG: Retain tz transformation in groupby.transform) (#27521)

meeseeksmachine
authored and
jreback
committed
Backport PR #27556: BUG: Allow ensure_index to coerce nan to NaT with numpy object array and tz Timestamp (#27561)

meeseeksmachine
authored and
jreback
committed
Backport PR #27549: BUG: Fix interpolate ValueError for datetime64_tz index (#27560)

meeseeksmachine
authored and
jreback
committed

Commits on Jul 25, 2019

Backport PR #27511: BUG: display.precision of negative complex numbers (#27587)

meeseeksmachine
authored and
jreback
committed
Backport PR #27488: API: Add entrypoint for plotting (#27590)

meeseeksmachine
authored and
jreback
committed

Commits on Jul 30, 2019

Backport PR #27631: BUG: raise when wrong level name is passed to "unstack" (#27640)

meeseeksmachine
authored and
jreback
committed
DOC: improve warnings for Series.{real,imag} (#27651) (#27659)

jorisvandenbossche
authored and
TomAugspurger
committed

Commits on Aug 1, 2019

DOC:Update python version support info (#27580)

sameshl
authored and
jreback
committed