core: avoid fixed :csys domain, always use input domain

lib/core/core.ex

@@ -63,7 +63,7 @@ defmodule Scopes.Core do
     end
   end
 
-  def data_only(), do: filter_head([:csys, :data])
+  def data_only(dom \\ :csys), do: filter_head([dom, :data])
 
   # send shortcuts
 
@@ -72,14 +72,15 @@ defmodule Scopes.Core do
     Actor.send(rcvr, Shape.create(head, data: data))
   end
 
-  def send_value(rcvr, val) do
+  def send_value(rcvr, val, dom \\ :csys) do
-    send_message(rcvr, [:csys, :data], %{value: val}) 
+    send_message(rcvr, [dom, :data], %{value: val}) 
   end
 
   # notifications
 
   def notify_created(msg, new, scope) do
-    msg1 = Shape.create(~w(csys created)a, 
+    [dom | _rest] = Shape.head(msg)
+    msg1 = Shape.create([dom, :created], 
       data: Map.merge(Shape.data(msg), %{old: self(), new: new}))
     notify(msg1, scope)
   end