Add methods for piecewise exponential distributions

[mclements]

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Devin,

As a start, here are some modest changes for piecewise exponential distributions.

Please shout out if anything is unclear.

Kindly, Mark.

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Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 92.72%. Comparing base (e218e24) to head (2523781). Report is 35 commits behind head on main.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #137      +/-   ##
==========================================
+ Coverage   92.51%   92.72%   +0.20%     
==========================================
  Files          64       64              
  Lines        5544     6252     +708     
==========================================
+ Hits         5129     5797     +668     
- Misses        415      455      +40     

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[mclements]

Devin: I have also added some casts in a number of integer comparisons to address some long-standing warnings.