[WIP] Calibration bug fix

[trishorts]

Failure to calibrate one file in a list of files leaves the tolerances of common params adjusted too wide for the subsequent scan. This PR changes the code to use a local copy of common params for each calibrated file that is created anew for each separate file.

[trishorts]

Also using this opportunity to substitute explicit variables for var and to update code with discards, which showed up in C# 7 https://docs.microsoft.com/en-us/dotnet/csharp/fundamentals/functional/discards

[codecov[bot]]

Codecov Report

Merging #2135 (ef1dbd4) into master (341d25e) will increase coverage by 0.09%. The diff coverage is 91.11%.

@@            Coverage Diff             @@
##           master    #2135      +/-   ##
==========================================
+ Coverage   90.91%   91.00%   +0.09%     
==========================================
  Files         133      133              
  Lines       19999    19999              
  Branches     2772     2772              
==========================================
+ Hits        18183    18201      +18     
+ Misses       1311     1297      -14     
+ Partials      505      501       -4     

Impacted Files	Coverage Δ
EngineLayer/ExperimentalDesign.cs	100.00% <ø> (+10.28%)	:arrow_up:
TaskLayer/MyTaskResults.cs	100.00% <ø> (ø)
TaskLayer/CalibrationTask/CalibrationTask.cs	89.14% <91.11%> (+3.16%)	:arrow_up: