Merge branch 'dev_yy' into dev

yanyuan

2023-09-05 b262ab5a8021b0a3b9bb4bab78c52981ac39e35e

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