Shift in modification positions on SequenceBoard

The modification on SequenceBoard are shifted by 1 nucl. (is it always the case ? To verify)

added Doing bug + 1 deleted label

assigned to @julien.touchais

created branch 34-shift-in-modification-positions-on-sequenceboard to address this issue

mentioned in merge request !11 (merged)

added Done label and removed Doing label

closed

removed Done label

added Done label