Simulation time not calculated correctly in python

[portaloffreedom]

revolve/pyrevolve/util/time.py

Line 198 in ecdc525

return self.sec + self.nsec / 10.0e9

nanoseconds should be divided by 1.0e9, not 1.0e10

[portaloffreedom]

as an example, this problem is shown in this chart, where time events are not equally spaced (time x axis and expected x axis):

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