ARR: Check for duplicate signatures before copying

[haroldrubio]

Resolves #2368 and resolves #2376

Before the changes to the script, the additional registration form in the June cycle would break the tests since the registration tests have a maxReplies of 1

[melisabok]

This is a reminder how to fix a bug:

1. Write a test to reproduce it, expect an assertion to fail (in this case: the multi reply error)
2. Modify the code that fixes the bug
3. Re-run the test and expect the test to pass

The last commits don't even pass because the test itself has bugs. You need to run the test in your machine and do the 3 steps that I mentioned before.

No matter how long it takes.

[haroldrubio]

I've been using the CircleCI tests to run my tests because there's some strange bug in my local that's preventing even master from passing

[melisabok]

Fix master in your machine first before doing anything.