Improve Neuralynx tests by being more strict regarding testing data.
Improve Neuralynx tests by being more strict regarding testing data.

Previously, this test was succeeding with erroneous test files due to the high tolerance.

JuliaSprenger/python-neo,samuelgarcia/python-neo,INM-6/python-neo,apdavison/python-neo,NeuralEnsemble/python-neo