[PATCH] ob-R async evaluation

[Jeremie Juste]

Hello,

I'm attaching a patch that clean up a bit of non conventional coding
practices (mainly because of my ignorance), in ob-R. These were
initially generating warning during the compilation of org-mode.

The main feature is the use of the defvaralias ess-eval-visibly-p when
the :result output in async evaluation. 

With this change make does not generate any warning for ob-R.el and all
the test of ob-R.el passes, so no significant change for the user.

Best regards,
Jeremie

0001-ob-R.el-Patch-4-async-evaluation.patch
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