Everyone talks about the SME, but they really mean the M. That's the midsize in small and medium-sized enterprise. Executives at business travel booking tech firm Serko are going after the S. They say this collectively huge segment of the business world is due for recognition with quality travel management services. Serko is releasing a business travel management program dedicated to small companies next month in New Zealand, followed by Australia. In partnership with nuTravel for content, Serko will soon add . . .