Add VersionIntervals, a view of VersionRange
Add VersionIntervals, a view of VersionRange

as a sequence of non-overlapping intervals. This provides a canonical
representation for the semantics of a VersionRange. This makes several
operations easier.

20081202141040-adfee-c0fa38a681faafe7b5dee32ad90aede3ba6258e3.gz

dcreager/cabal,dcreager/cabal