Different log lines with the same timestamp are interleaved in dumpstate mode

[Mikhail Lopatkin]

Different log lines with the same timestamp are interleaved in dumpstate mode:

Main log: A1, A2, A3

Event log: B1, B2

We can get A1 B1 A2 A3 B2 even if they have the same timestamp.

Expected result: A1, A2, A3, B1, B2, B3

[Mikhail Lopatkin]

Added buffer comparison in case of equivalent timestamps (fixed #62)

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