hist: generate histograms

Generates DTrace-style power-of-two histograms from streams of numbers. On systems with jot(1) to generate random data, try:

$ jot -r 10 | ~/Manta/MarlinTools/hist2/hist 
           value  ------------- Distribution ------------- count
             0.5 |                                         0
               1 |@@@@                                     1
               2 |                                         0
               4 |                                         0
               8 |                                         0
              16 |@@@@@@@@                                 2
              32 |@@@@@@@@@@@@                             3
              64 |@@@@@@@@@@@@@@@@                         4
             128 |                                         0

Your example will differ because that "-r" generates random data. For deterministic, sequential data:

$ seq 10 100 | ~/Manta/MarlinTools/hist2/hist 
           value  ------------- Distribution ------------- count
               4 |                                         0
               8 |@@@                                      6
              16 |@@@@@@@                                  16
              32 |@@@@@@@@@@@@@@                           32
              64 |@@@@@@@@@@@@@@@@                         37
             128 |                                         0