[RFC] LTS branch of Portage

Hi, everyone.

I've been thinking about this for some time already, and the recent
FILESDIR mess seems to confirm it: I'd like to start a more stable LTS
branch of Portage.

Roughly, the idea is that:

- master becomes 3.1.x, and primary development happens there

- 3.0.x becomes the LTS branch and only major bugfixes are backported
there

As things settle down in the future, master would become 3.2.x, 3.1.x
would become LTS, 3.0.x will be discontinued and so on.

WDYT?

-- 
Best regards,
Michał Górny