Deprecation updates and redo _fast_norm_logpdf

[cmbant]

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[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 93.75000% with 1 line in your changes missing coverage. Please review.

Project coverage is 82.10%. Comparing base (22b9ab4) to head (e92e9e8).

Files	Patch %	Lines
cobaya/install.py	75.00%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #373      +/-   ##
==========================================
- Coverage   82.11%   82.10%   -0.01%     
==========================================
  Files         146      146              
  Lines       11188    11190       +2     
==========================================
+ Hits         9187     9188       +1     
- Misses       2001     2002       +1     

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