Switch to side-by-side view

--- a/Allura/allura/model/filesystem.py
+++ b/Allura/allura/model/filesystem.py
@@ -162,6 +162,7 @@
         if content_type is None:
             content_type = utils.guess_mime_type(filename)
         if not content_type.lower() in SUPPORTED_BY_PIL:
+            log.debug('Content type %s from file %s not supported', content_type, filename)
             return None, None
 
         try: