Merges all related fits of the fit history
 into fit sequences sharing the same fit sequence start time.



 Two fit sequences may belong to the same fit settings,
 model and data sets: they belong to the same fit group.
 Function like pwFitSequenceAnalysis work on the last
 fit sequence unless specified otherwise.

 The function pwFitHistoryMergeFitSequences merges all
 fit sequences as far as possible, i.e. the number of
 fit sequences will be the same as the number of fit groups.
 This is done by assigning the earliest fit sequence start
 time to all fits belonging to the same fit group.

See also