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network: prevent time overflow in DataRate.

Tolik Zinovyev requested to merge tolikzinovyev/ns-3-dev:data-rate-overflow into master

I noticed that changing the time resolution from picoseconds to femtoseconds significantly changes the outcome of my simulation. The problem turned out to be in DataRate::CalculateBitsTxTime() which overflows Time with input 21000 bits. The proposed fix is using int64x64_t to calculate the number of seconds before instantiating Time.

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