Save covariance matrix hints as well as max-post hints where possible

[joezuntz]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 92.00000% with 4 lines in your changes missing coverage. Please review.

Project coverage is 62.85%. Comparing base (de6e077) to head (fef0195).
Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
cosmosis/samplers/hints.py	88.88%	1 Missing ⚠️
cosmosis/samplers/kombine/kombine_sampler.py	0.00%	1 Missing ⚠️
cosmosis/samplers/pymc/pymc_sampler.py	0.00%	1 Missing ⚠️
cosmosis/test/test_samplers.py	95.83%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #160      +/-   ##
==========================================
- Coverage   62.86%   62.85%   -0.01%     
==========================================
  Files         117      117              
  Lines       12776    12792      +16     
==========================================
+ Hits         8031     8041      +10     
- Misses       4745     4751       +6     

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