Fixed glitches and improved on the settings about the number of decimals that should be used to display data about atoms/oligomers/polymers

Added #define's for the number of decimal places used for mass reports in function of the polymer/oligomer/atom chemical entity involved.

Added possibility to edit the sequence by clicking the code items in the list of available monomers in the sequence editor window.

Removed use of the QT_NETWORK lib as the internet-based monitoring of program's usage has been removed.

Added possibility to edit a sequence by clicking onto the items of the monomer list in the sequence editor window's right pane. Useful when monomer codes are not yet known. Also removed the multi-selection flag from the list widget.

Fixed bug whereby performing a cleavage after having had no oligomers in the treeview would crash the program: the program would attempt to remove rows from the treeview, while there we no one.

Fixed nasty regression bug that would crash the program upon pasting a sequence that would contain invalid monomer codes.

This reverts commit e061cf5e.

Fixed bug which would crash the program upon selection of a sequence starting after its last monomer

Added feature to enable accounting left/right end modif of polymer for selected sequences even when the selected region does not encompass the left/right end(s) of the polymer sequence. See telokin paper by Rusconi et al. 1998 in Biochemistry for details.