Switch to side-by-side view

--- a/Allura/allura/model/__init__.py
+++ b/Allura/allura/model/__init__.py
@@ -5,7 +5,7 @@
 
 from .neighborhood import Neighborhood, NeighborhoodFile
 from .project import Project, ProjectCategory, ProjectFile, AppConfig, ScheduledMessage
-from .index import ArtifactReference, Shortlink, IndexOp
+from .index import ArtifactReference, Shortlink
 from .artifact import Artifact, Message, VersionedArtifact, Snapshot, Feed, AwardFile, Award, AwardGrant
 from .discuss import Discussion, Thread, PostHistory, Post, DiscussionAttachment
 from .attachments import BaseAttachment