[yt-dev] Issue #635: find_max() is broken for particle codes: (yt_analysis/yt)

[Nathan Goldbaum]

New issue 635: find_max() is broken for particle codes:
https://bitbucket.org/yt_analysis/yt/issue/635/find_max-is-broken-for-particle-codes

Nathan Goldbaum:

```
pf.h.find_max(('deposit', 'Gas_density'))
---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
<ipython-input-5-d81b7d6ae9ea> in <module>()
----> 1 pf.h.find_max(('deposit', 'Gas_density'))

AttributeError: 'ParticleGeometryHandler' object has no attribute 'find_max'
```

I think this operation will fail for RAMSES as well.