MultiCellDS saves `elapsed_time_in_phase` twice?

[drbergman]

As best I can tell, elapsed_time_in_phase is being saved twice:

1. https://github.com/MathCancer/PhysiCell/blob/3d7051f167b6b3551296a4b6d93db742dc532ee6/modules/PhysiCell_MultiCellDS.cpp#L1769
2. https://github.com/MathCancer/PhysiCell/blob/3d7051f167b6b3551296a4b6d93db742dc532ee6/modules/PhysiCell_MultiCellDS.cpp#L1807

Note: these two are appended to the list of labels in the output xml here:

1. https://github.com/MathCancer/PhysiCell/blob/3d7051f167b6b3551296a4b6d93db742dc532ee6/modules/PhysiCell_MultiCellDS.cpp#L942-L950
2. https://github.com/MathCancer/PhysiCell/blob/3d7051f167b6b3551296a4b6d93db742dc532ee6/modules/PhysiCell_MultiCellDS.cpp#L1091-L1099