Switch to side-by-side view

--- a
+++ b/doc/makefile
@@ -0,0 +1,9 @@
+
+all: libupnpp-ctl.html
+
+libupnpp-ctl.html: libupnpp-ctl.txt
+	asciidoc libupnpp-ctl.txt
+
+ref: 
+	doxygen Doxyfile
+