Since probably version 8.2 of Org I could not store links from Gnus.
After some investigation it appears that org-store-link was faulty, not
allowing me to choose between functions.  The cause is that
completing-read was not called properly, attached patch (hopefully)
fixes this.

Bug is trigged only if multiple store link functions are available,
which was my case since I included org-nnml.el as well as org-gnus.el.


Emacs  : GNU Emacs 23.4.1 (i486-pc-linux-gnu, GTK+ Version 2.24.10)
 of 2012-09-09 on murphy, modified by Debian
Package: Org-mode version 8.2.5g (8.2.5g-dist @ /home/benj/usr/share/emacs/site-lisp/org/)

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* Benjamin Drieu <bdrieu@april.org> - http://www.april.org/
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