Merge pull request #210 from ashawley/2.13-collections

Re-work 2.13 collections changes

Author: ashawley

jvm/src/test/scala/scala/xml/ReuseNodesTest.scala

@@ -1,6 +1,7 @@
 package scala.xml
 
 import scala.xml.transform._
+import scala.collection.Seq
 import org.junit.Assert.assertSame
 import org.junit.experimental.theories.Theories
 import org.junit.experimental.theories.Theory

jvm/src/test/scala/scala/xml/SerializationTest.scala

@@ -1,5 +1,6 @@
 package scala.xml
 
+import scala.collection.Seq
 import org.junit.Assert.assertEquals
 import org.junit.Test
 

jvm/src/test/scala/scala/xml/XMLTest.scala

@@ -11,6 +11,7 @@ import java.io.StringWriter
 import java.io.ByteArrayOutputStream
 import java.io.StringReader
 import scala.collection.Iterable
+import scala.collection.Seq
 import scala.xml.Utility.sort
 
 object XMLTestJVM {

shared/src/main/scala/scala/xml/Atom.scala

@@ -9,6 +9,8 @@
 package scala
 package xml
 
+import scala.collection.Seq
+
 /**
  * The class `Atom` provides an XML node for text (`PCDATA`).
  *  It is used in both non-bound and bound XML representations.

shared/src/main/scala/scala/xml/Attribute.scala

@@ -9,6 +9,8 @@
 package scala
 package xml
 
+import scala.collection.Seq
+
 /**
  * This singleton object contains the `apply` and `unapply` methods for
  *  convenient construction and deconstruction.

shared/src/main/scala/scala/xml/Document.scala

@@ -9,6 +9,8 @@
 package scala
 package xml
 
+import scala.collection.Seq
+
 /**
  * A document information item (according to InfoSet spec). The comments
  *  are copied from the Infoset spec, only augmented with some information

shared/src/main/scala/scala/xml/Elem.scala

@@ -11,6 +11,8 @@
 package scala
 package xml
 
+import scala.collection.Seq
+
 /**
  * This singleton object contains the `apply` and `unapplySeq` methods for
  *  convenient construction and deconstruction. It is possible to deconstruct

shared/src/main/scala/scala/xml/Equality.scala

@@ -9,6 +9,8 @@
 package scala
 package xml
 
+import scala.collection.Seq
+
 /**
  * In an attempt to contain the damage being inflicted on consistency by the
  *  ad hoc `equals` methods spread around `xml`, the logic is centralized and

shared/src/main/scala/scala/xml/Group.scala

@@ -9,6 +9,8 @@
 package scala
 package xml
 
+import scala.collection.Seq
+
 /**
  * A hack to group XML nodes in one node for output.
  *

shared/src/main/scala/scala/xml/MetaData.scala

@@ -14,6 +14,7 @@ package xml
 import Utility.sbToString
 import scala.annotation.tailrec
 import scala.collection.AbstractIterable
+import scala.collection.Seq
 
 object MetaData {
   /**