[yt-dev] proper handling species fields

[Chris Malone]

At Britton's great suggestion, let's move the discussion of what to do with
species fields from BitBucket comments to here.  For reference, see the
discussion in the comments here [1].  Note that the current situation is
outlined in YTEP-003, specifically the section on species names [2].

The main issue is that yt supports a wide range of codes, which are
applicable in various domains of science and sometimes the nomenclature
clashes.  What is meant by 'species' is a prime example.  'Species' can
mean atomic elements, ions, or nuclei (perhaps others?), and the definition
of each of these should - if it is possible - be made explicit.

Agreeing on the yt-internal nomenclature for this explicitness requires
some discussion.

[1]
https://bitbucket.org/yt_analysis/yt/pull-request/1240/bugfix-fixing-nuclei-density-fields/diff
[2]
http://ytep.readthedocs.org/en/latest/YTEPs/YTEP-0003.html#molecular-and-atomic-species-names

Chris
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