void EDL::modify_edithandles(double oldposition, double newposition,
int currentend, int handle_mode, int edit_labels,
int edit_plugins, int edit_autos, int group_id)
void EDL::modify_edithandles(double oldposition, double newposition,
int currentend, int handle_mode, int edit_labels,
int edit_plugins, int edit_autos, int group_id)