Note:

All the programs in the GOTTFR/EXTEND/ folder should be run in extended mode 
with option base set to 1:

$ dib -x -b <filename>

If you don't use the -x option, an error will be raised when some extended
function or statement is met. If you don't use the -b option, nothing should
happen as long as the 0 index is never called.
Other options are freely usable.
