Fixed deallocation cleanup

Minor view changes

Sketching path bar to use for search as hint to where the entries are
Some experiments with the filter bar (extracted the view to a separate nib)

MacPass/MPDatabaseDocument.m

@@ -91,6 +91,7 @@ NSString *const MPDidLoadDataBaseNotification = @"DidLoadDataBaseNotification";
   self.tree = nil;
   self.file = nil;
   self.password = nil;
+  self.key = nil;
   [super dealloc];
 }