vector for DPH

[Simon Peyton-Jones]

| * Release 7.0 including DPH using the new library that is based on
| vector.

OK let's do that then.  

Roman: the consequence is that pushing your patches is now very urgent.  Ian is going to start making the release candidate in 24 hrs or so.

| I think using a different package name is a reasonable compromise.
| Personally, I think "dph-vector" or "ghc-vector" would be sufficiently
| explicit to show that it is not a HP sanctioned package, but I could live
| with something slightly more obscure, too.

I really wonder whether it's worth the bother.  (And I'm sure there will be bother, as we apply bug-fixes to 'vector' that must be propagated to 'dph-vector'.) 

Yes, the 'vector' package will be installed, but it'll be hidden.  Yes a Cabal package that depends on 'vector' would install without downloading and installing 'vector'; but is that so bad?

I think we are making a bit of a mountain out of a mole hill here.  It's not even as if 'vector' was in a terrible state; we intend to kick off the HP process for it shortly, so it soon will be a HP package.  

I suggest that it might be simpler just to let sleeping dogs lie and do what we did with GHC 6.12; ie ship with GHC but as a hidden package.  

Simon