Fh/fix 266

[apfelix]

fix #266

cached properties of the model's MatrixAccessor are cleared (if existent) at the start of solve, to avoid using old cached data on resolving the model after modification.

I also added a pytest for this, which failed before and works now.

[apfelix]

code coverage upload failed for some reason, could you have a look at this @FabianHofmann ?

[FabianHofmann]

@apfelix thanks for your PR! I retriggered the CI, don't know where that came from.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.70%. Comparing base (f0c8457) to head (55c0bb4).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #290      +/-   ##
==========================================
- Coverage   89.69%   86.70%   -3.00%     
==========================================
  Files          16       16              
  Lines        4019     4024       +5     
  Branches      939      941       +2     
==========================================
- Hits         3605     3489     -116     
- Misses        281      411     +130     
+ Partials      133      124       -9     

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[FabianHofmann]

Awesome! thanks @apfelix