Enable resuming the importance sampler

[joezuntz]

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[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 22.22222% with 7 lines in your changes missing coverage. Please review.

Project coverage is 59.94%. Comparing base (921e2a9) to head (96de422).

Files	Patch %	Lines
cosmosis/samplers/importance/importance_sampler.py	22.22%	7 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #138      +/-   ##
==========================================
- Coverage   60.00%   59.94%   -0.06%     
==========================================
  Files         117      117              
  Lines       12308    12316       +8     
==========================================
- Hits         7385     7383       -2     
- Misses       4923     4933      +10     

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