Seed runs with random number generator seeds

[xcthulhu]

In order to have reliable tests, we need to be able to seed the random number generator.

As of last week LightCurve.py can now in principle be seeded, but the seed needs to be injected somehow.

Other modules also need this treatment.

[Neoshika]

Mostly for reference, here are all files/lines from the main SPyFFI folder which reference random or seed (any .py file not mentioned has no references):
Catalogs.py lines 85 (trying to set a seed), 108,242,272,276,277
CCD.py lines 811,833,1052
Cosmics.py None, but there is clearly some randomness going on in cosmical_realistic
defaults.py line 152 (setting a default seed=0)
Jitter.py lines 20(trying to set a seed), 36
Lightcurve.py lines 44,54,104,115,120,124,133
Noise.py line 188
Stamper.py lines 28, 62 (modifying the seed for each CCD), 85