[O] Replaced obsolete interactive-p function

[Bastien]

Dear all,

interactive-p is obsolete since Emacs 23.2 and should be replaced by
called-interactively-p.

The org-called-interactively-p macro takes care of using either
interactive-p or called-interactively-p.  

I've just updated the latest git and Org uses org-called-interactively-p
wherever it makes sense.

Please report any weird compilation warnings and/or problems.

Thanks!

-- 
 Bastien