improve Setting construction

- make all constructing methods end in = for lowest precedence
- rename Scope constructing method 'apply' to 'in' to allow 'apply' to
    be used on single settings as well as tuples and 'in' reads better

util/collection/Attributes.scala

@@ -65,5 +65,6 @@ final case class Attributed[D](data: D)(val metadata: AttributeMap)
 }
 object Attributed
 {
+	implicit def blankSeq[T](in: Seq[T]): Seq[Attributed[T]] = in map blank
 	implicit def blank[T](data: T): Attributed[T] = Attributed(data)(AttributeMap.empty)
 }