Increase numerical tolerance on a torsion unit test.
Increase numerical tolerance on a torsion unit test.

I hope this is not just hiding a real error, but I think it's just a 
numerical discrepancy on my machine.

faribas/RMG-Py,enochd/RMG-Py,nyee/RMG-Py,KEHANG/RMG-Py,nickvandewiele/RMG-Py,comocheng/RMG-Py,enochd/RMG-Py,pierrelb/RMG-Py,comocheng/RMG-Py,KEHANG/RMG-Py,nyee/RMG-Py,chatelak/RMG-Py,faribas/RMG-Py,nickvandewiele/RMG-Py,pierrelb/RMG-Py,chatelak/RMG-Py