Implement support of tqdm package

[Johann Krauter]

The tqdm · PyPI package makes a smart progress meter output in the command line. Whould be cool to support this kind of output.

from tqdm import tqdm
for i in tqdm(range(10000)):
    ...
76%|████████████████████████       | 7568/10000 [00:33<00:10, 229.00it/s]

Now, each increment is written in a new line:

for i in tqdm(range(100000000),desc="Looping through the loop"):
  pass

Looping through the loop:   0%|          | 0/100000000 [00:00<?, ?it/s]
Looping through the loop:   0%|          | 431084/100000000 [00:00<00:23, 4302053.94it/s]
Looping through the loop:   1%|1         | 1044657/100000000 [00:00<00:18, 5365258.36it/s]
Looping through the loop:   2%|1         | 1657539/100000000 [00:00<00:17, 5698153.08it/s]
Looping through the loop:   2%|2         | 2312023/100000000 [00:00<00:16, 6010961.48it/s]

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