Rename member variables and add new ones

[apulsipher]

The PR introduces renames to several member variables and their associated getters to better reflect their functionality. In particular, this involves pre-pending the word "all" to variables that include data for multiple samples.

It also adds new member variables m_current_proposed_stats and m_current_accepted_stats with getters and updates them accordingly in the run() function.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.08%. Comparing base (e673f04) to head (f7f3ab5).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #45      +/-   ##
==========================================
+ Coverage   84.03%   84.08%   +0.04%     
==========================================
  Files          42       42              
  Lines        2775     2783       +8     
==========================================
+ Hits         2332     2340       +8     
  Misses        443      443              

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[gvegayon]

Two minor comments: make sure that the functions you added/edited that don't modify the class have the const suffix. Thank you!

[apulsipher]

@gvegayon I just added the const suffix as you requested. Is it good to merge now?