Overlapping signals

I have noticed that there is an extremely large number of dbc files that have overlapping signals. This makes it impossible to use the dbc file to properly encode and decode a can message.

I spent a long number of hours fixing the gm_global_a_\* dbc files so there are no more overlaps. I am not sure to what extent the others have overlaps I would have to check each file that is not generated. I know I have loaded a few files other then the gm_global_a_\* files and there are signal overlaps in the ones I loaded.