Performance issues in Binning stage

[delucchi-cmu]

Bug report

From @gitosaurus:

Planning and mapping ran without any errors this time, still taking about the same duration (4h), which I expected. However, the binning phase looks stuck. it says there are two iterations to do, and it has not done even one, and it's been something like 13h and counting (if I subtract the 4h from 17h total runtime).
Planning : 100%|████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████| 4/4 [00:00<00:00, 10.82it/s]
Mapping : 100%|████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████| 176561/176561 [3:50:52<00:00, 12.75it/s]
Binning : 0%| | 0/2 [00:00<?, ?it/s]

If possible, speed up the binning phase of catalog creation. At the very least, make the progress bar more informative, as it's not just doing 2 things, it's doing 176563 things.

[gitosaurus]

Final timing for the binning phase: 20h 55m 03s according to its tqdm output.

Splitting phase is predicting something on the order of 6h.