Version specific onlinedocs page

[Gerald Pfeifer]

On Mon, 18 Feb 2013, Tobias Burnus wrote:
>> If "we" means that you are volunteering ;-), absolutely, go for it!
> ;-)
> 
> 
> How about the following patch? If it is okay, I will add the remaining 
> index.html for 4.6 and 4.7 and update gcc-4.6/index.html – and then 
> commit it.

Looks good to me.

Perhaps you can add a note for the release manager how to "create"
index.html (copy from previous release and adjust)?

Gerald