Implemented remaining functions in namespace Random;
Renamed namespace clock to Clock to avoid name clashes.
Added static method Client::reset();
Expanded requisition.h documentation;
Corrected identation in requisition.cpp.
Finished generate_requisition();
Added network_efficiency() random distribution function;
Implemented namespace Clock;
Modified signature of Clock::advance to return a string vector;
Modified signature of EventGenerator::advance to return a string.
Partial implementation of 'server'.