- add hashstats, a small program to help analyze hash files:

Usage: ./hashstats [-n NUM] [-a] [-b] [-l] hashfile
Where "hashfile" is a file generated by running duperemove
with the '--write-hashes' option. By default a list of hashes
with the most shared blocks are printed.

        <switches>
        -n NUM          Print top N hashes, sorted by bucket size.
                        Default is 10.
        -a              Print all hashes (overrides '-n', above)
        -b              Print info on each block within our hash buckets
        -l              Print a list of all files
        --help          Prints this help text.

Signed-off-by: Mark Fasheh <mfasheh@suse.de>
- track allocation of objects
  - dump this information on ENOMEM or if the debug flag is passed in

Signed-off-by: Mark Fasheh <mfasheh@suse.de>