more releases

[Stephen Paul Weber]

>having a large number of versions of GHC out there can make it difficult
>for library authors, package curators, and large open source projects, due
>to variety of what people are using.

For point releases, if we do it right, this *should* not happen, since the 
changes *should* be backwards-compatible and so testing against the oldest 
release on the current major version *should* mean all subsequent point 
releases work as well.  IMHO, any violation of this assumption *should* be 
considered a (serious) bug.