Report EICs characteristics

[jdesport]

Users may visualize extracted ion chromatograms.
It would be useful to have the characteristics of the EIC automatically reported in a table: retention time at peak maximum, FWHM, area.
This is especially useful for analysis where a chromatogram peak picking is not possible (ex: SEC or IMS data).
(A determination of FWHM from a gaussian fit would be even better.)