1999/03/18
- offset specification (dump) ???
  -o from0, to0, from1, to1, ...  OR
  -o from0, +num0, from1, +num1, ... OR  mixed like
  -o from0, to0, from1, +num1, ...
  EOF or empty field stands for until EOF
1999-10-28
- man page: explain grouping by 4
- switch: switch off grouping
1999-11-22
- implement explicite offset specification in unhxd (-n, -o) and change
  open mode back to no-trunc
- implement offset reading from input file
