[oe] RFC: Making it mandantory to have a checksums.ini entry

[Sledz, Steffen]

> > Would be a good idea to update 
> > <http://wiki.openembedded.net/index.php/Update_checksums.ini>,
> > so that this information is available outside this mailing list.
>    
> I added a new page http://wiki.openembedded.net/index.php/Checksums 
> because its not so much related to policy.

Then the old page should be deleted to avoid confusions.