[Orgmode] Org-mode version 5.15

[Carsten Dominik]

Hi,

as usually, the latest release contained some stupid bugs.  Thanks for the
fast reports, 5.15 at http://orgmode.org fixed them and has the
following additions:

Changes in Version 5.15
~~~~~~~~~~~~~~~~~~~~~~~

Details
=======

   - There are new special properties TIMESTAMP and TIMESTAMP_IA.
     These can be used to access the first keyword-less active
     and inactive timestamp in an entry, respectively.

   - New variable `org-clock-heading-function'.  It can be set to
     a function that creates the string shown in the mode line
     when a clock is running.  Thanks to Tom Weissmann for this
     idea.

   - Bug fixes.