SDoE: Implementing previous data into IRSF

[sotorrio1]

Fixes/Addresses:

Addresses issue #1077

Summary/Motivation:

In the SDoE module, IRSF designs where already implemented but they weren't accepting previous data files. Now IRSF is also able to handle previous data file like USF and NUSF.

Changes proposed in this PR:

• adding previous data file to required functions in irsf.py
• adapting the IRSF plotting to show previous data points (plot_utils.py)
• refactoring in nusf.py and irsf.py to reduce repetitive code

Legal Acknowledgement

By contributing to this software project, I agree to the following terms and conditions for my contribution:

1. I agree my contributions are submitted under the copyright and license terms described in the LICENSE.md file at the top level of this directory.
2. I represent I am authorized to make the contributions and grant the license. If my employer has rights to intellectual property that includes these contributions, I represent that I have received permission to make contributions and grant the required license on behalf of that employer.

[pn51]

@mirandamartin Can you provide us with a write-up of the algorithm details so that we can confirm that the changes we made are valid?

[codecov]

Codecov Report

Patch coverage: 80.19% and project coverage change: -0.19 ⚠️

Comparison is base (d625542) 34.95% compared to head (467042b) 34.76%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1096      +/-   ##
==========================================
- Coverage   34.95%   34.76%   -0.19%     
==========================================
  Files         161      161              
  Lines       36432    36296     -136     
  Branches     5953     5940      -13     
==========================================
- Hits        12734    12618     -116     
+ Misses      22715    22696      -19     
+ Partials      983      982       -1     

Impacted Files	Coverage Δ
foqus_lib/gui/sdoe/sdoeAnalysisDialog.py	0.00% <0.00%> (ø)
foqus_lib/gui/sdoe/sdoeSimSetup.py	9.53% <ø> (ø)
foqus_lib/framework/sdoe/plot_utils.py	7.62% <10.00%> (-0.07%)	⬇️
foqus_lib/framework/sdoe/irsf.py	86.36% <85.71%> (+1.47%)	⬆️
foqus_lib/framework/sdoe/distance.py	94.11% <100.00%> (+1.52%)	⬆️
foqus_lib/framework/sdoe/nusf.py	84.27% <100.00%> (-0.58%)	⬇️
foqus_lib/framework/sdoe/sdoe.py	55.55% <100.00%> (+0.29%)	⬆️

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[mirandamartin]

Designs created during testing look good to me. And the runtime is significantly improved. Thanks for all the hard work!