Animated progress bars for catalogs

I often compute large dendrograms and catalogs, and while I find the dendrogram animated progress bar invaluable, I realized that I spend way too much time waiting cluelessly for the correspondingly large catalogs to compute. So here's a quick implementation of animated progress bars for catalogs, too.

It looks like this:

```python
In [3]: catalog = astrodendro.ppv_catalog(d, metadata, verbose=True)
Computing catalog for 301 structures
[========================================>] 100%

```

The main critique I can foresee of this implementation: maybe instead of overloading the previously-existing `verbose` kwarg in `ppv_catalog` and `pp_catalog` (which currently controls whether the warnings print out or not), I should use a new kwarg (`progressbar=True` or something). The advantage of the current usage is that it's parallel to `Dendogram.compute`'s use of `verbose`.
Yes. Compare with the progress bar in `dendrogram.py`
https://github.com/dendrograms/astrodendro/blob/master/astrodendro/dendrogram.py#L197