tqdm progressbar not compatible with nbsphinx and nbconvert>7.13

[hakonanes]

Our two tutorial notebooks showing tqdm progressbars (clustering misorientations and pole density functions) have these cell outputs:

I'm 99% sure this is the cause of #475.

I've updated my issue to the nbsphinx devs at spatialaudio/nbsphinx#781 referencing #485. The temporary solution is to pin nbconvert to < 7.14, as discussed in spatialaudio/nbsphinx#776. This issue has reported upstream in nbconvert as well: jupyter/nbconvert#2092.

[hakonanes]

This means the mentioned tutorials look ugly in our current docs latest (develop) and stable (0.12.1)... I suggest to make a post-release 0.12.1.post0, just as we did for 0.9.0.post0 (#299). This should fix the stable docs.

[hakonanes]

Leaving this open as a reminder to unpin nbconvert when the following issues are resolved:

• Nbconvert >= 7.14 produces error in Sphinx build jupyter/nbconvert#2092
• Error on cells using progress bar (tqdm) spatialaudio/nbsphinx#776

[hakonanes]

This issue is not seen with nbconvert 7.16.4.