Concurrent Write Handling

[CharlesAverill]

This must be a configurable option as none of these options are perfect

• [ ] Store changes locally and only distribute when each potential receiver node has approved the change
• [ ] Git-like automatic merging (not even sure if this one makes sense, seems like you'd need to decrypt the entire file to find the necessary changes to do the merge, and then re-encrypt, seems very inefficient no matter what)