Comment 3 for bug 974590

I think a good solution would be to warn the user once he wants to save a month file that has changed while he opened it (we would have to save the time of opening the file). Then he should be presented with the differences and be able to decide if he wants to merge the changes or just keep one of the versions. This would also allow to use multiple copies of RedNotebook (which is actually useful, because people often use multiple journals).