[O] new exporter and latex attributes

[Rick Frankel]

Has the syntax for latex attributes changed in the new exporter, or is
is the following a bug?

Given this source file:

* Test width attribute
#+ATTR_LATEX: width=3in
#+begin_src dot :file t.png 
  digraph g { a -> b }
#+end_src

#+results:
[[file:t.png]]

The old exporter generats:
#+begin_src latex
  \includegraphics[width=3in]{t.png}
#+end_src

And the new exporter
#+begin_src latex
  \includegraphics[width=.9\linewidth]{t.png}
#+end_src

which ignores the width override.

rick