Whatsnew reorganization
Changes

1. Adds a highlights section (open to suggestions on what should be added / removed from here)
2. Reorders the enhcancements section to be
    1. Highlighted features
    2. Other features (sections)
    3. List of other new features (one-liners)
3. Reorders the "Backwards incompatible changes" section. We had two lists of "other incompatible changes" that I've merged into one at the end of the section.
4. Moved extension type changes out of the "Backwards incompatible changes section". 

cc @jorisvandenbossche 
lgtm. after CI fixes are merge, let's repush and merge on green. # [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/24799?src=pr&el=h1) Report
> Merging [#24799](https://codecov.io/gh/pandas-dev/pandas/pull/24799?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/b99f8bc3ce4b0d5aa71e2caf8db5e6dc4dbc42de?src=pr&el=desc) will **increase** coverage by `0.02%`.
> The diff coverage is `n/a`.

[![Impacted file tree graph](https://codecov.io/gh/pandas-dev/pandas/pull/24799/graphs/tree.svg?width=650&token=eZ4WkYLtcO&height=150&src=pr)](https://codecov.io/gh/pandas-dev/pandas/pull/24799?src=pr&el=tree)

```diff
@@            Coverage Diff             @@
##           master   #24799      +/-   ##
==========================================
+ Coverage   42.92%   42.94%   +0.02%     
==========================================
  Files         166      166              
  Lines       52382    52382              
==========================================
+ Hits        22485    22498      +13     
+ Misses      29897    29884      -13
```

| Flag | Coverage Δ | |
|---|---|---|
| #single | `42.94% <ø> (+0.02%)` | :arrow_up: |

| [Impacted Files](https://codecov.io/gh/pandas-dev/pandas/pull/24799?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [pandas/io/json/json.py](https://codecov.io/gh/pandas-dev/pandas/pull/24799/diff?src=pr&el=tree#diff-cGFuZGFzL2lvL2pzb24vanNvbi5weQ==) | `62.85% <0%> (+1.19%)` | :arrow_up: |
| [pandas/core/internals/construction.py](https://codecov.io/gh/pandas-dev/pandas/pull/24799/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvaW50ZXJuYWxzL2NvbnN0cnVjdGlvbi5weQ==) | `64.21% <0%> (+2.03%)` | :arrow_up: |

------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/24799?src=pr&el=continue).
> **Legend** - [Click here to learn more](https://docs.codecov.io/docs/codecov-delta)
> `Δ = absolute <relative> (impact)`, `ø = not affected`, `? = missing data`
> Powered by [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/24799?src=pr&el=footer). Last update [b99f8bc...6c603d0](https://codecov.io/gh/pandas-dev/pandas/pull/24799?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
 # [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/24799?src=pr&el=h1) Report
> Merging [#24799](https://codecov.io/gh/pandas-dev/pandas/pull/24799?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/98f46f7f08e9f15374fd840507438cb237313a9e?src=pr&el=desc) will **increase** coverage by `49.46%`.
> The diff coverage is `n/a`.

[![Impacted file tree graph](https://codecov.io/gh/pandas-dev/pandas/pull/24799/graphs/tree.svg?width=650&token=eZ4WkYLtcO&height=150&src=pr)](https://codecov.io/gh/pandas-dev/pandas/pull/24799?src=pr&el=tree)

```diff
@@             Coverage Diff             @@
##           master   #24799       +/-   ##
===========================================
+ Coverage   42.92%   92.38%   +49.46%     
===========================================
  Files         166      166               
  Lines       52382    52382               
===========================================
+ Hits        22485    48395    +25910     
+ Misses      29897     3987    -25910
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `90.81% <ø> (?)` | |
| #single | `42.92% <ø> (ø)` | :arrow_up: |

| [Impacted Files](https://codecov.io/gh/pandas-dev/pandas/pull/24799?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [pandas/core/computation/pytables.py](https://codecov.io/gh/pandas-dev/pandas/pull/24799/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvY29tcHV0YXRpb24vcHl0YWJsZXMucHk=) | `92.37% <0%> (+0.3%)` | :arrow_up: |
| [pandas/io/pytables.py](https://codecov.io/gh/pandas-dev/pandas/pull/24799/diff?src=pr&el=tree#diff-cGFuZGFzL2lvL3B5dGFibGVzLnB5) | `92.31% <0%> (+0.92%)` | :arrow_up: |
| [pandas/util/\_test\_decorators.py](https://codecov.io/gh/pandas-dev/pandas/pull/24799/diff?src=pr&el=tree#diff-cGFuZGFzL3V0aWwvX3Rlc3RfZGVjb3JhdG9ycy5weQ==) | `90.54% <0%> (+4.05%)` | :arrow_up: |
| [pandas/compat/\_\_init\_\_.py](https://codecov.io/gh/pandas-dev/pandas/pull/24799/diff?src=pr&el=tree#diff-cGFuZGFzL2NvbXBhdC9fX2luaXRfXy5weQ==) | `57.91% <0%> (+8.1%)` | :arrow_up: |
| [pandas/core/config\_init.py](https://codecov.io/gh/pandas-dev/pandas/pull/24799/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvY29uZmlnX2luaXQucHk=) | `99.24% <0%> (+9.84%)` | :arrow_up: |
| [pandas/core/reshape/util.py](https://codecov.io/gh/pandas-dev/pandas/pull/24799/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvcmVzaGFwZS91dGlsLnB5) | `100% <0%> (+11.53%)` | :arrow_up: |
| [pandas/core/api.py](https://codecov.io/gh/pandas-dev/pandas/pull/24799/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvYXBpLnB5) | `100% <0%> (+13.33%)` | :arrow_up: |
| [pandas/compat/numpy/\_\_init\_\_.py](https://codecov.io/gh/pandas-dev/pandas/pull/24799/diff?src=pr&el=tree#diff-cGFuZGFzL2NvbXBhdC9udW1weS9fX2luaXRfXy5weQ==) | `92.85% <0%> (+14.28%)` | :arrow_up: |
| [pandas/core/computation/common.py](https://codecov.io/gh/pandas-dev/pandas/pull/24799/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvY29tcHV0YXRpb24vY29tbW9uLnB5) | `85.71% <0%> (+14.28%)` | :arrow_up: |
| [pandas/core/indexes/api.py](https://codecov.io/gh/pandas-dev/pandas/pull/24799/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvaW5kZXhlcy9hcGkucHk=) | `99% <0%> (+14.85%)` | :arrow_up: |
| ... and [123 more](https://codecov.io/gh/pandas-dev/pandas/pull/24799/diff?src=pr&el=tree-more) | |

------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/24799?src=pr&el=continue).
> **Legend** - [Click here to learn more](https://docs.codecov.io/docs/codecov-delta)
> `Δ = absolute <relative> (impact)`, `ø = not affected`, `? = missing data`
> Powered by [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/24799?src=pr&el=footer). Last update [98f46f7...bd1a319](https://codecov.io/gh/pandas-dev/pandas/pull/24799?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
 Gonna just fix the merge conflict and merge if that's OK (other PR removed a section). @TomAugspurger 

Seems that comment about the hashable dtype we talked about hasn't made it into master yet. Just mentioning if you still wanna do that before release. Hmm keep forgetting to update it.

On Wed, Jan 23, 2019 at 4:20 PM h-vetinari <notifications@github.com> wrote:

> @TomAugspurger <https://github.com/TomAugspurger>
>
> Seems that comment about the hashable dtype we talked about hasn't made it
> into master yet. Just mentioning if you still wanna do that before release.
>
> —
> You are receiving this because you were mentioned.
> Reply to this email directly, view it on GitHub
> <https://github.com/pandas-dev/pandas/pull/24799#issuecomment-456989187>,
> or mute the thread
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