Merge branch 'dev_yy' into dev

yanyuan

2023-09-05 c179ab5f3f347b5b6acd6066dadd23c8031a486b

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Quintiq file version 2.0
#parent: #root
Function CalcDuration
{
  TextBody:
  [*
    // soh yee Feb-17-2014 (created)
    value := guard( this.End() - this.Start(), Duration::Zero() );
    
    this.Duration( value );
  *]
}