Fix the problem of having failed symbolic linking of the -dbg package's doc directory to the massxpert's.

Configured packaging for storing the debug symbols in the massxpert-dbg binary package. Bump up debian version to 3.2.0-2.

New feature allowing fragmentation simulations for oligomers involving cross-link completed. User manual updated.

Implemented a warning message dialog box to the user whenever the selected sequence portion to be fragmented encompasses (partially or fully) a cross-link, telling that no cross-links are taken into account in this kind of calculation.

Only create a StringProp object to store the elemental formula of the oligomer if the calculation process is actually based on a formula.

When no elemental formula is available in an oligomer, do not abort, simply warn the user and suggest to uncheck the Isotopic cluster check box.

When starting a SpectrumCalculationDlg dialog, make it modal so that all data of the parent are accessible for the lifetime of the child dialog.