Exercise: SNMP numbers

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• SNMP numbers are strings consisting a series of integers separated by dots: 1.5.2, 3.7.11.2
• Create a class that can hold such an snmp number. Make sure we can compare them with less-than (the comparision is pair-wise for each number until we find two numbers that are different. If one SNMP number is the prefix is the other then the shorter is "smaller").
• Add a class-method, that can tell us how many SNMP numbers have been created.
• Write a separate file to add unit-tests