Scope interface - attaching variable lists

• ATTACH(@outputs, "w")
  Attaches variable list in write mode: data copied from Scope model variables to FLCOMMS data block
• ATTACH(@inputs, "r")
  Attaches variable list in read mode: data copied from FLCOMMS data block to Scope model variables
• ATTACH([])
  Disconnects from FLCOMMS block
• Read-mode variable lists automatically read before invoking an operation
• Write-mode variable lists automatically written after invoking an operation
• APCTL("sync");
  Manually synchronizes attached variable lists with FLCOMMS