multitrait changes

[bhaller]

This branch is the long-term branch for changes to implement multiple phenotypic traits in SLiM; it will likely become SLiM 5.1 or SLiM 6.0. It is is active development, and will often not build; it is not recommended for end users until further notice.

[codecov]

Codecov Report

❌ Patch coverage is 78.06181% with 575 lines in your changes missing coverage. Please review.
✅ Project coverage is 75.89%. Comparing base (b76a8d7) to head (700b2dd).
⚠️ Report is 5 commits behind head on master.

Files with missing lines	Patch %	Lines
core/mutation.cpp	72.74%	178 Missing ⚠️
core/substitution.cpp	59.47%	92 Missing ⚠️
core/haplosome.cpp	57.02%	52 Missing ⚠️
core/mutation_block.cpp	42.85%	48 Missing ⚠️
core/polymorphism.cpp	41.17%	40 Missing ⚠️
core/species.cpp	77.94%	30 Missing ⚠️
core/species_eidos.cpp	88.49%	26 Missing ⚠️
core/trait.cpp	84.80%	19 Missing ⚠️
core/population.cpp	81.11%	17 Missing ⚠️
core/subpopulation.cpp	76.92%	15 Missing ⚠️
... and 15 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #531      +/-   ##
==========================================
+ Coverage   75.44%   75.89%   +0.44%     
==========================================
  Files         114      116       +2     
  Lines       72405    74096    +1691     
  Branches    12803    13148     +345     
==========================================
+ Hits        54624    56233    +1609     
- Misses      17781    17863      +82     

Files with missing lines	Coverage Δ
core/chromosome.h	48.48% <ø> (ø)
core/community.h	100.00% <ø> (ø)
core/community_eidos.cpp	91.43% <100.00%> (+0.13%)	⬆️
core/genomic_element.h	100.00% <ø> (ø)
core/genomic_element_type.h	100.00% <ø> (ø)
core/individual.cpp	45.07% <ø> (-3.30%)	⬇️
core/individual.h	32.75% <ø> (ø)
core/interaction_type.h	90.32% <ø> (ø)
core/mutation.h	75.00% <ø> (-8.34%)	⬇️
core/mutation_type.h	100.00% <100.00%> (ø)
... and 52 more

... and 7 files with indirect coverage changes

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