[yt-dev] duplicate obtain_rvec and obtain_rv_vec functions in source

[Britton Smith]

Hi all,

It seems that there are two definitions in the yt source of the following
functions:
- obtain_rvec
- obtain_rv_vec

For each of these, one is in utilities/lib/misc_utilities.pyx and the other
is in utilities/lib/geometry_utils.pyx.  Also in each case, the source code
for each is extremely similar, with the versions in misc_utilities
containing additional keywords.  At least in the case of obtain_rv_vec,
both versions are called in different places in the code.  Does anyone know
of a reason for this?  If there is one, this looks like a mess that should
probably be cleaned up.

Britton
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