Add parameter to exportToAres function

[fdefalco]

A new parameter 'reports' should be added to the exportToAres function. The reports parameter should default to all available reports. If a user supplies a different list of reports (in a c()) then only those reports named should be exported.

For example if a user supplied c('procedure') then this would only execute the generateAOProcedureReports function instead of all available reports.