Merge branch 'dev_yy' into dev

yanyuan

2023-09-06 efb7b5c7ee8424268f48a168e7f5b869030d3a9b

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Quintiq file version 2.0
#parent: #root
Method Flush
{
  Description: 'Flushes the messages of this sequence'
  TextBody: 'this.Message( relflush);'
}