updated to scala-2.12.2;

--- a/Admin/components/main	Fri May 19 16:14:24 2017 +0200
+++ b/Admin/components/main	Fri May 19 16:43:11 2017 +0200
@@ -12,7 +12,7 @@
 nunchaku-0.3
 polyml-5.6-1
 postgresql-9.4.1212
-scala-2.11.8
+scala-2.12.2
 ssh-java-20161009
 spass-3.8ds
 sqlite-jdbc-3.8.11.2

--- a/src/Pure/General/antiquote.scala	Fri May 19 16:14:24 2017 +0200
+++ b/src/Pure/General/antiquote.scala	Fri May 19 16:43:11 2017 +0200
@@ -55,4 +55,3 @@
     }
   }
 }
-

--- a/src/Tools/jEdit/src/theories_dockable.scala	Fri May 19 16:14:24 2017 +0200
+++ b/src/Tools/jEdit/src/theories_dockable.scala	Fri May 19 16:43:11 2017 +0200
@@ -166,7 +166,7 @@
 
   private class Node_Renderer extends ListView.Renderer[Document.Node.Name]
   {
-    def componentFor(list: ListView[_], isSelected: Boolean,
+    def componentFor(list: ListView[_ <: isabelle.Document.Node.Name], isSelected: Boolean,
       focused: Boolean, name: Document.Node.Name, index: Int): Component =
     {
       val component = Node_Renderer_Component

--- a/src/Tools/jEdit/src/timing_dockable.scala	Fri May 19 16:14:24 2017 +0200
+++ b/src/Tools/jEdit/src/timing_dockable.scala	Fri May 19 16:43:11 2017 +0200
@@ -65,7 +65,7 @@
 
     class Renderer extends ListView.Renderer[Entry]
     {
-      def componentFor(list: ListView[_],
+      def componentFor(list: ListView[_ <: Timing_Dockable.this.Entry],
         isSelected: Boolean, focused: Boolean, entry: Entry, index: Int): Component =
       {
         val component = Renderer_Component