add ability to define headers aliases for output summary files, add a
new parameter named summary_headers_aliases for a poincare plot;
this new parameter must correspond to summary_statistics_names
parameter; an example of use:
summary_statistics_names =
'CaTime,CdTime,C1dTime,C2dTime,C1aTime,C2aTime'
summary_headers_aliases  =
'CsTime,CwTime,C1wTime,C2wTime,C1sTime,C2sTime'