SDoE: embedding SDoE plots into QDialog windows

[sotorrio1]

Fixes/Addresses:

Attempt to fix window stack ordering embedding matplotlib plots into QDialog windows

Summary/Motivation:

When plotting in SDoE, plots are shown as matplotlib objects and when the plots are closed the window stack ordering gets all messed up

Changes proposed in this PR:

• returning plots as figure objects instead of using plot.show()
• creating Window class to add figure object to it

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[ksbeattie]

It is likely that the tests are failing here because of the changes in the way the new QDialog windows are used. If so, then the tests themselves will need updating for this PR. Looking at the OUU and UQ gui-tests and code are structured could help.

[codecov]

Codecov Report

Attention: 41 lines in your changes are missing coverage. Please review.

Comparison is base (f69912d) 37.31% compared to head (6dc445b) 37.67%.

Files	Patch %	Lines
foqus_lib/gui/sdoe/sdoePreview.py	10.52%	34 Missing ⚠️
foqus_lib/gui/sdoe/sdoeAnalysisDialog.py	16.66%	5 Missing ⚠️
foqus_lib/framework/sdoe/plot_utils.py	81.81%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1171      +/-   ##
==========================================
+ Coverage   37.31%   37.67%   +0.35%     
==========================================
  Files         160      160              
  Lines       36396    36439      +43     
  Branches     5956     5961       +5     
==========================================
+ Hits        13582    13727     +145     
+ Misses      21726    21609     -117     
- Partials     1088     1103      +15     

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[sotorrio1]

@lbianchi-lbl was right, the problem with SDoE GUI tests was the way sdoeAnalysisDialog was getting open.

[ksbeattie]

@sotorrio1 is this ready for review now? Were there more tests you were going to write?

[sotorrio1]

@ksbeattie Yes, it's ready for review. I added a couple of tests for plotting functions and tried to add some extra stuff into the existing GUI testing. @lbianchi-lbl might have some comments on the GUI testing stuff