#126 - select does not return instances of all (transitive) subtypes of the type queried for

[reckart]

• added type.descendants property
• use this property instead of the children property in _get_feature_structures and _get_feature_structures_in_range
• added unit test for descdentants

[codecov[bot]]

Codecov Report

Merging #127 into master will increase coverage by 0.03%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #127      +/-   ##
==========================================
+ Coverage   97.67%   97.70%   +0.03%     
==========================================
  Files           9        9              
  Lines        1547     1569      +22     
==========================================
+ Hits         1511     1533      +22     
  Misses         36       36              

Impacted Files	Coverage Δ
cassis/cas.py	97.70% <100.00%> (-0.03%)	:arrow_down:
cassis/typesystem.py	96.72% <100.00%> (+0.04%)	:arrow_up:
tests/test_cas.py	100.00% <100.00%> (ø)
tests/test_typesystem.py	100.00% <100.00%> (ø)

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