[OE-core] Bitbake minimum version increment likely soon

[Richard Purdie]

This is just a heads up that I'm likely to increase the minimum version
of bitbake OE-Core depends on soon. This has been brewing for a while
since there is some new data store syntax I'd like to start using (e.g.
d.appendVar). 

The reason to do it now is to deal with various siggen issues that are
becoming apparent. I proposed the changes several months ago in pseudo
code but have now written the patches and would like to take advantage
of them. These get rid of the horrible regexp and use a python function
to filter dependencies instead.

There have also been error handling improvements in bitbake recently and
I'd like to ensure people benefit from those too.

Cheers,

Richard