remove duplication of QC obs data set csv files

[eosnas]

In 2010 the bird observation data for the ACP is written to the output legacy data twice. AKaerial should only write the obs data once for each observer. In years where observers swap out so that for design based estimates combining observer for a side of the plane is needed, only write data once per observer. Leave the combining as an internal process within AKaerial as part of the estimation process.

Look at other years and surveys where this issue might apply and fix.