Result.Summarize shoud display operating point of multiple rotors
Commit e388a3b5 modified the code to fit a coaxial model.
issue : The method summarize.m in Result.m do not display correctly the summary of the results.
Each rotor was calculated well and all their performances appear in the multi-columns cT_leishman, cT_indfact..., one sub-column corresponding to one rotor performances. However the rotors' operating points are wrongly displayed.
For now, 'rpm' and 'collective' are single columns that only show first rotor operating points, so this can lead to a confusion.
'rpm' and 'collective' also need to be multi-columns.