Unify handling of Field and FieldMixed

[adtzlr]

Warning: This breaks backward compatibility.

Motivation

Due to different handlings of a default Field and a mixed Field, the code is unnecessary complex and hard to read. The idea is to unify both kind of Fields, using a FieldContainer (which is basically just a renamed FieldMixed). Beside a cleaner source code, the user interface improves by a unified field handling inside the forms and tools.

Furthermore, the current IntegralForm class should be hidden in the global namespace and be replaced by IntegralFormMixed as new IntegralForm.

This also improves the interface to matADi by avoiding the wrapper MatadiMaterial due to identical API.

Tasks

• Rename FieldMixed to FieldContainer d14c740
• Adopt SolidBody to use the new FieldContainer d14c740
• Deactivate Basis and Forms until finished 098cbab
• Adopt dof module to use FieldContainer aec3f2e
• Change constitution module for FieldContainer fd356e2
• Adopt tools 4445810
• Fix value extraction of a field caf9104
• Allow IntegralForm with one field a62bfe7
• Modernize solve (rename u0ext to ext0 e0087ec
• Import only one IntegralForm to the global namespace b125568
• Adopt test_readme.py 0c56754## Tasks

...and a lot of small fixes...

Removed

• Remove wrapper for matADi materials fe1d292

fixes #228
fixes #230

[codecov-commenter]

Codecov Report

Merging #229 (460614e) into main (b6a30cf) will decrease coverage by 1.69%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #229      +/-   ##
==========================================
- Coverage   98.28%   96.59%   -1.70%     
==========================================
  Files          67       66       -1     
  Lines        2865     2760     -105     
==========================================
- Hits         2816     2666     -150     
- Misses         49       94      +45     

Impacted Files	Coverage Δ
felupe/__init__.py	92.59% <ø> (ø)
felupe/_assembly/_mixed.py	96.96% <ø> (+1.38%)	⬆️
felupe/_basis/_basis.py	85.71% <ø> (ø)
felupe/constitution/__init__.py	100.00% <ø> (ø)
felupe/_assembly/_form.py	74.85% <100.00%> (-24.61%)	⬇️
felupe/_field/__init__.py	100.00% <100.00%> (ø)
felupe/_field/_container.py	100.00% <100.00%> (ø)
felupe/_field/_fields.py	100.00% <100.00%> (ø)
felupe/constitution/_kinematics.py	95.08% <100.00%> (+0.53%)	⬆️
felupe/constitution/_mixed.py	100.00% <100.00%> (ø)
... and 16 more

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.