bug#1958: 23.0.60; org-mode does not honour shift-select-mode

[Andreas Amann <andreas.amann@tyndall.ie>]

May I just add one little aspect to this:

Note that in org-mode the shift-arrow keys only work, when the cursor is on an item line 
(i.e. one starting with at least one "*")! Otherwise the shift-arrow keys simply give the error 
"Not in an item", and blocks a potentially useful binding without real benefit. 

Would it therefore be possible to only switch on the org-specific shift-arrow binding on item lines, 
where they are only useful anyhow?  I.e. instead of printing the error message, one could fall back 
to whatever the standard binding outside org-mode is. This would be fairly intuitive from a user 
point of view in my opinion. The only complication might be to decide, what should happen, when 
shift-selecting from a non-item line into an item line. 

Andreas