[rho,e](P, T) failing for Carnahan Starling on some systems

[Yurlungur]

As reported by @gopsub

     302 26: Scenario: CarnahanStarling6
     303 26:       Given: Parameters for a CarnahanStarling EOS
     304 26:       Given: Pressure and temperature
     305 26:        When: A rho(P, T) lookup is performed
     306 26:        Then: The returned rho(P, T) should be equal to the
true value
     307 26:
-------------------------------------------------------------------------------
     308 26:
/usr/projects/silverton/users/gss/xxx/test/test_eos_carnahan_starling.cpp:674
     309 26:
...............................................................................
     310 26:
     311 26:
/usr/projects/silverton/users/gss/xxx/test/eos_unit_test_helpers.hpp:80:
FAILED:
     312 26:   CHECK( isClose(z[i], ztrue[i], 1e-12) )
     313 26: with expansion:
     314 26:   false
     315 26: with message:
     316 26:   i: 0, Pressure: 1.01324999999999988e+06, Temperature:
2.98149999999999977e+
     317 26:   02, Value: 1.00000000000000000e+03, True Value:
1.18330120712910694e-03
     318 26:

[Yurlungur]

This is rocinante with default modules