* sort is compatible with Unix sort when a key-end spec refers to the N'th
character in a field that has fewer than N characters
* tail with old-style options like -20k and +31m operates on units of bytes,
- as --help documentation says. Before, it used units of lines.
+ as the --help usage message says. Before, it used units of lines.
Changes in release 1.15
* od gives better diagnostics for invalid format specs
* uses automake-generated Makefile templates