document 'ctr_transfer'

--- a/src/Doc/Datatypes/Datatypes.thy	Tue Aug 19 16:46:31 2014 +0200
+++ b/src/Doc/Datatypes/Datatypes.thy	Tue Aug 19 16:46:33 2014 +0200
@@ -856,6 +856,10 @@
 \begin{indentblock}
 \begin{description}
 
+\item[@{text "t."}\hthm{ctr_transfer}\rm:] ~ \\
+@{thm list.ctr_transfer(1)[no_vars]} \\
+@{thm list.ctr_transfer(2)[no_vars]}
+
 \item[@{text "t."}\hthm{set} @{text "[simp, code]"}\rm:] ~ \\
 @{thm list.set(1)[no_vars]} \\
 @{thm list.set(2)[no_vars]}