[O] New feature: loop over siblings for some commands

[Bastien]

Dear all,

from latest git repo: 

  (setq org-loop-over-siblings-within-active-region-p t)

will allow you to run some commands on several siblings in 
the active region.  

For example:

<start active region>
* Item 1
* Item 2
* Item 3
<end active region>

Then `C-c C-s' (org-schedule) will ask for a schedule date
for each of the item in the active region.  See the commit
log for more details:

  
http://orgmode.org/w/?p=org-mode.git;a=commit;h=366254217ac6faea20a5d43fae065bd028806eab

I'm interested in allowing this for org-todo as well, but I
would first like some feedback on the current feature and its
scope wrt actual needs.

Thanks a lot!

-- 
 Bastien