MarginFigure environment in LaTeX export

[Louis Gostiaux]

Hello,

Here is a patch to allow the margin value for float option in figure 
environment.

The marginfigure environment is proposed by the LateX sidenotes package 
and is commonly used in book editions. I needed it to edit with 
EmacsOrgmode a book with the Tufte-book class. I could use this new 
export properly and I now want to propose it to the OrgMode users.

Please tell me if the submission procedure is correct,

Louis Gostiaux.

0001-Included-margin-float-value-for-figure-environment-t.patch
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