[SCM] efficient 2D data-plotting library annotated tag, upstream/2.3.1, created. upstream/2.3.1

[Picca Frédéric-Emma?==?UTF-8?Q?nuel]

The annotated tag, upstream/2.3.1 has been created
        at  4bba327c8720af773cbf46ee8768658fd7390d0d (tag)
   tagging  45d4eb19154463712ff21654116426b15bfee899 (commit)
  replaces  upstream/2.3.0
 tagged by  Picca Frédéric-Emmanuel
        on  Sat May 25 13:06:40 2013 +0200

- Shortlog ------------------------------------------------------------
Upstream version 2.3.1

Picca Frédéric-Emmanuel (1):
      Imported Upstream version 2.3.1

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efficient 2D data-plotting library