wrapper around Log::Report and Log::Report::Minimal

 Log::Report::Optional will allow libraries (helper modules) to have a
 dependency to a small module instead of the full Log-Report distribution. The
 full power of Log::Report is only released when the main program uses that
 module. In that case, the module using the 'Optional' will also use the full
 Log::Report, otherwise the dressed-down Log::Report::Minimal version.