Bug in the relaunch_group method

Hello,

I found the deadlock and why commenting the “del” solved it:
If you delete the group, then you will enter in this 'if" section ans then increment “self.n_submitted_simulations”.
Then, you will never enter this “if” section, causing the server to wait indefinitely.
One dirty fix is to add:

self.n_submitted_simulations -= 1

before the call to “self.generate_client_scripts” in “relaunch_group.py”.

Sincerely,

Théophile Terraz