Introduce EOT (end-of-transmission) marker

Change-Id: I7946e95c80fd7cd6ac1e0dd2fe5b188105f30534
diff --git a/.gitignore b/.gitignore
index e328550..e781219 100644
--- a/.gitignore
+++ b/.gitignore
@@ -7,4 +7,5 @@
 !.gitignore
 \#*
 *.info
-datok
\ No newline at end of file
+datok
+old_*
\ No newline at end of file