annex: secure hashes only; disable auto commit on sync

gitconfig

@@ -34,6 +34,10 @@
 	participants = 8D2902FE7DF47DDEDA2802F9456B9A0399A5DA2F
 	publish-participants = false
 
+[annex]
+	securehashesonly = true
+	autocommit = false
+
 [alias]
 	c = commit
 	d = diff