[oe] Versioning and upgrade paths

[Koen Kooi]

Hi,

I noticed people adding recipes with PVs in the form of '2.6.28rc4', 
which is wrong:

'2.6.28rc4' will sort higher than '2.6.28', so upgrading to the release 
from the RC will be impossible.

Now some people will start arguing that kernel upgrades using a package 
manager shouldn't be done, but that's not the point. An upgrade path 
should always be provided, even if the distro/user/developer will choose 
to not use it.

The wiki page about the OE versioning policy has background information 
and samples on how to contruct a proper PV:

http://wiki.openembedded.net/index.php/Versioning_Policy

regards,

Koen