Leaf::getInfo () now returns boost::shared_ptr<const NameInfo> instead of NameInfo reference as before.

SyncLogic is temporarily broken
diff --git a/model/sync-full-leaf.cc b/model/sync-full-leaf.cc
index ee1d3dc..3636860 100644
--- a/model/sync-full-leaf.cc
+++ b/model/sync-full-leaf.cc
@@ -37,7 +37,7 @@
 FullLeaf::updateDigest ()
 {
   m_digest.reset ();
-  m_digest << getInfo ().getDigest () << *getSeq ().getDigest ();
+  m_digest << getInfo ()->getDigest () << *getSeq ().getDigest ();
   m_digest.finalize ();
 }