[RM-7207] [linemodel free] output in resultStore the groups of lines fitted jointly

Created on 2022-04-22 08:40:41 by Didier Vibert. % Done: 0

in linemodel free, when lines with independant amplitudes (ie ratios free) overlaps, their amplitudes are fitted jointly (linear inversion via SVD)

the grouping of such lines because of overlapping support is not stored in the resultStore. The info can be usefull at the end...

(there is already a member m_fittingGroupInfo the the class CLineModelElement wich is set for each line element with the id of the first overlapping element found)