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Raise an exception if after many tries the replicas are still negative

Emanuele Roberto Nocera requested to merge crash_if_replica_negative into master

Created by: scarlehoff

I've empirically chosen the very conservative 1e6 as the number of tries because in my laptop the worst group takes about 5 minutes. I think it can safely be lowered but I preferred to start high.

Fixes #1783 (closed)

This is how an error would look like:

[INFO]: Loading positivity dataset POSXSQ                                                                                                                                                                                                                                                                                   
[INFO]: Loading positivity dataset POSXSB                                                                                                                                                                                                                                                                                   
[INFO]: Loading positivity dataset POSXGL                                                                                                                                                                                                                                                                                   
[ERROR]: Error generating replicas for CDFZRAP_NEW                                                                                                                                                                                                                                                                          
[CRITICAL]: Bug in n3fit ocurred. Please report it.                                                                                                                                                                                                                                                                         
Traceback (most recent call last):                                                                                                                                                                                                                                                                                          
 <etc>                                                                                                                                                                                                                                                                                                 
validphys.pseudodata.ReplicaGenerationError: No valid replica found after 1000000 attempts

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