* lisp/ox-latex.el (org-latex-image-default-scale): Nev variable.
(org-latex--inline-image): Handle new :scale parameter.
* doc/org-manual.org (Images in LaTeX export): document the new :scale
Introduce a :scale #+ATTR_LATEX parameter, as well as a "" default
value for it. When present, it overrides :width and :height
parameters (as it does for ODT export and in ox-pandoc exporters).
Implementation: uses \scalebox for tikz/pgf images, "scale=" parameter
of \includegraphics in other cases.
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