Switch to side-by-side view

--- a/src/sampleconf/mimeview
+++ b/src/sampleconf/mimeview
@@ -27,6 +27,8 @@
 # Open the parent epub document for epub parts instead of opening them as
 # html documents. This is almost always what we want.
 text/html|epub = ebook-viewer %F;ignoreipath=1
+
+application/x-gnote = gnote %f
 
 application/x-mobipocket-ebook = ebook-viewer %f