Disable the bulge: G4 breaks when simulating electrons.

Exaple: core dump after a bunch of messages like
-------- WWWW ------- G4Exception-START -------- WWWW -------
*** G4Exception : GeomNav1002
      issued by : G4PropagatorInField::ComputeStep()
Particle is stuck; it will be killed.
  Zero progress for 51 attempted steps.
  Proposed Step is 9.53619e-06 but Step Taken is 9.53619e-06
  For Particle with Charge = -1 Momentum = 0.0369031 Mass = 0.510999
 in volume World
*** This is just a warning message. ***
-------- WWWW -------- G4Exception-END --------- WWWW -------

-------- WWWW ------- G4Exception-START -------- WWWW -------
*** G4Exception : GeomNav1002
      issued by : G4PropagatorInField::ComputeStep()
Particle is stuck; it will be killed.
  Zero progress for 51 attempted steps.
  Proposed Step is 9.69454e-06 but Step Taken is 9.69454e-06
  For Particle with Charge = -1 Momentum = 0.0343162 Mass = 0.510999
 in volume World
*** This is just a warning message. ***
-------- WWWW -------- G4Exception-END --------- WWWW -------
Rename a stopped muon fcl file, and tune the range of generator momentum histogram.
Implement a Gaussian spectrum generator.
Apply temperature correction to GABS and cradle gases.
Apply temperature correction to air.