Bumping "extralib" library versions

[Isaac Dupree]

Ian Lynagh wrote:
> We do actually need to pick one or the other really quite quickly for
> the GHC 6.8.1 release, although I don't think getting it wrong and
> changing our minds later will cause any major problems. My impression
> from those opinions I've read is that 4-component is more likely to be
> the concensus.

FWIW, I prefer the 4-component becoming the standard one.

I wonder if the notions of API version and code version ought to be 
separable...

Isaac