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[devs] allows negative time in time advance
A funny behaviour: if a vle::devs::Dynamics::timeAdvance
returns a negative value, VLE kernel will interpret this value as an absolute date instead of a duration. Seems to be useful to (re)synchronize model with integer dates and permits to reduce real representation problems.
However: how to build negative absolute date?
Prohibits negative begin date?
@duboz : we merge this behaviour in VLE2 or not?