Format name with all intermediates for disambiguation

[adriaandegroot]

Fixes #5

This replaces the "just-the-rightmost-dataset-name-component" logic by "components-of-the-name-unique-after-the-previous-one". Output with default options looks like

dataset                                         w/s      wMB/s        r/s      rMB/s   wareq-sz   rareq-sz
zroot                                          0.00       0.00       0.00       0.00       0.00       0.00
   ROOT/default                                0.00       0.00       3.88       0.00       0.00       0.16
   tmp                                         0.00       0.00       0.00       0.00       0.00       0.00

(e.g. here instead of default being indented two, and ROOT being invisible, we get the dataset-name-components that distinguish it from zroot, the previously-printed name)

[Freaky]

I tried a similar approach and think it's less than ideal for readability:

dataset                                         w/s      wMB/s        r/s      rMB/s   wareq-sz   rareq-sz
rpool/ROOT/ubuntu_geaox3                       0.00       0.00       0.00       0.00       0.00       0.00
         srv                                   0.00       0.00       0.00       0.00       0.00       0.00

At a glance can you tell me where srv lives? It's fairly obvious it's not rpool if you're used to the standard indentation, but it's less obvious if it's under ROOT or ubuntu_geaox3.

From the same output:

   USERDATA/freaky_uik8tg                      0.00       0.00       0.00       0.00       0.00       0.00
      root_uik8tg                              0.00       0.00       0.00       0.00       0.00       0.00

Both of these live at the same level in the hierarchy, but are displayed differently and easily confused for nested datasets.

[jimsalterjrs]

is this branch dead now that I've accepted @Freaky's solution?

[jimsalterjrs]

I'm going to assume this one is effectively dead. Thanks for the contribution though, @adriaandegroot !