logging: try adding a progress bar to the output

[ClemensBuechner]

Trying successor 403120/2131151 (18%) [======> ]

[FlorianPommerening]

tqmd seems to be the package of choice: https://github.com/tqdm/tqdm
It seems to require some extra bit of code to make it work in conjunction with the logging framework (I guess to allow log messages while a progress bar is running). https://stackoverflow.com/questions/38543506
There is also enlighten (https://pypi.org/project/enlighten/) that doesn't require this extra code. Both also support jupyter notebooks bu the support in enlighten was classified as experimental.