Switch to side-by-side view

--- a/src/README
+++ b/src/README
@@ -12,7 +12,7 @@
 
    This document introduces full text search notions and describes the
    installation and use of the Recoll application. It currently describes
-   Recoll 1.14.
+   Recoll 1.15.
 
    [ Split HTML / Single HTML ]