[yt-dev] Request for code review

Hi all,

I opened a few pull requests last week that I'd like some eyes on.

In particular, these PRs:

Fixing a memory leak in the volume renderer, this involves some low-level cython changes to the volume rendering machinery:

https://github.com/yt-project/yt/pull/1435

Fixing an issue with "seams" in deeply nested AMR datasets:

https://github.com/yt-project/yt/pull/1433

Remove some unused C code:

https://github.com/yt-project/yt/pull/1430

Update YTArray to support some new features in the upcoming Numpy 1.13 release:

https://github.com/yt-project/yt/pull/1422

Thanks for your help!

-Nathan