Add TODO notes about ClassManifest -> ClassTag migration
Move org.scalacheck.Arg to org.scalacheck.Prop.Arg
Move Pretty and ConsoleReporter types to util package
Make CmdLineParser private to scalacheck package
Move org.scalacheck.Choose to org.scalacheck.Gen.Choose
Fix some scaladoc warnings
Remove the Prop.FM type alias
Remove old cross-build Scala versions