TODO (ideas) :
**************

Fpart:
- Improve sort by using, e.g. : http://en.wikipedia.org/wiki/External_sorting
- Display total size in final status
- As a second pass, remove partitions with no file (e.g. option -n with too many
  partitions, special partition #0 for option -s, ...)
- Make the program multithreaded for FS analysis
- Display/accept size in a human-friendly format

Autotools:
- Use config.h (for program version, data types, header inclusion,
  build options info [...])
- Add -Wall to CFLAGS when possible (gcc, clang)
