the prediction can now give the effect of a frameshift mutation until the next variation, even if it is on another cds part

corrected the coordinates in the graph gff and gaf. modified the positions of the segments to have them 1-based like the features

tried to adapt the code to use several cds. detected a problem in the coordinate system to correct in main

changed the reading of the variation file and the handling of its information so that it accepts cds in multiple parts