Support for arbitrary left/right contexts

Change-Id: I3f9efd8f9d0619d1fb43637373d7ecde5494313f
diff --git a/Changes b/Changes
index ef54526..aa58d1a 100644
--- a/Changes
+++ b/Changes
@@ -1,4 +1,4 @@
-0.34 2019-08-26
+0.34 2019-08-27
     - [bugfix] Ignore min:max order in distance operators
       (#67; diewald)
     - [feature] Support #COND() operator alias in C2 (#70; diewald)