Hi all,

this small patch adds :filelinkdescr to the list of possible header
arguments for babel source blocks.
Its intented functionality is to allow source blocks to return links to
files with description.

Two small examples:

,----[ example1 ]
| #+begin_src R :results graphics :file test.png :filelinkdescr here
|   plot(1:10)
| #+end_src
| 
| #+results:
| [[file:test.png][here]]
`----

,----[ example2 ]
| #+begin_src R :results graphics :file test2.png :filelinkdescr
|   plot(1:10)
| #+end_src
| 
| #+results:
| [[file:test2.png][test2.png]]
`----

If used with value ("here" in the example1) that value will become the
description.  If used without value (as in example2), the description is
taken from either the :file header argument or the results of the code block
evaluation (in that order).

Have not done much testing yet, though.

Regards,
Andreas