[O] Feature suggestion: support "scale=" includegraphics option in the builtin latex exporter.

[Emmanuel Charpentier]

Dear list,

Most graphics-able exporters support some form of a scale parameter,
sizing the resultant image as a function of the original graphics file
(intended) size.

This is true for:
  * built-in ODT exporter
  * ox-pandoc Latex/ODT/DOCX exporters.

This possibility comes handy to avoid (or at least master) the side
effects of scaling (fonts amplification, /reduction, bitmap fuzinness,
etc...).

It should be supported on the native LaTeX exporter (and possibly
"scale: 1" may become the default...).

In addition (but this is probably a different problem), some
scaling/sizing mechanism may be implemented for the HTML exporter.

--
Emmanuel Charpentier