Fix restoring ImpingingJet from HDF5

[ischoegl]

Changes proposed in this pull request

• Fix #1580
• Add unit test for StagnationFlame
• Improve error messages

If applicable, fill in the issue number this pull request is fixing

Closes #1580

If applicable, provide an example illustrating new features this pull request is introducing

Run samples/python/onedim/stagnation_flame.py example, then

In [1]: import cantera as ct
   ...: gas = ct.Solution('h2o2.yaml')
   ...: flame = ct.ImpingingJet(gas)
   ...: flame.restore('stagnation_flame_data/stagnation_flame.h5', 'mdot-0')
Out[1]:
{'cantera-version': '3.0.0b1',
 'date': 'Fri Aug 11 10:54:37 2023',
 'description': 'mdot = 0.06 kg/m2/s',
 'generator': 'Cantera SolutionArray',
 'git-commit': "'c92138c12'"}

Checklist

• [x] The pull request includes a clear description of this code change
• [x] Commit messages have short titles and reference relevant issues
• [x] Build passes (scons build & scons test) and unit tests address code coverage
• [x] Style & formatting of contributed code follows contributing guidelines
• [x] The pull request is ready for review

[codecov[bot]]

Codecov Report

Merging #1585 (0d854fb) into main (4b30fa7) will increase coverage by 0.07%. Report is 1 commits behind head on main. The diff coverage is 40.74%.

@@            Coverage Diff             @@
##             main    #1585      +/-   ##
==========================================
+ Coverage   70.51%   70.58%   +0.07%     
==========================================
  Files         379      379              
  Lines       59118    59134      +16     
  Branches    21237    21253      +16     
==========================================
+ Hits        41686    41739      +53     
+ Misses      14359    14322      -37     
  Partials     3073     3073              

Files Changed	Coverage Δ
include/cantera/oneD/Boundary1D.h	57.89% <ø> (+8.91%)	:arrow_up:
src/oneD/Sim1D.cpp	69.20% <20.00%> (-1.23%)	:arrow_down:
src/oneD/Boundary1D.cpp	60.08% <100.00%> (+4.68%)	:arrow_up:

... and 5 files with indirect coverage changes

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[ischoegl]

Thanks, @speth ... I believe this is ready to merge.