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 79.84774% with 450 lines in your changes missing coverage. Please review.
✅ Project coverage is 76.22%. Comparing base (b76a8d7) to head (7c992c6).
⚠️ Report is 6 commits behind head on master.

Files with missing lines	Patch %	Lines
core/mutation.cpp	72.74%	178 Missing ⚠️
core/haplosome.cpp	59.34%	50 Missing ⚠️
core/mutation_block.cpp	42.85%	48 Missing ⚠️
core/polymorphism.cpp	41.17%	40 Missing ⚠️
core/species.cpp	75.51%	36 Missing ⚠️
core/species_eidos.cpp	88.74%	26 Missing ⚠️
core/population.cpp	80.67%	23 Missing ⚠️
core/mutation_type.cpp	96.49%	10 Missing ⚠️
core/mutation_run.cpp	60.86%	9 Missing ⚠️
core/community.cpp	83.33%	8 Missing ⚠️
... and 10 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #531      +/-   ##
==========================================
+ Coverage   75.44%   76.22%   +0.77%     
==========================================
  Files         114      116       +2     
  Lines       72405    73631    +1226     
  Branches    12803    13040     +237     
==========================================
+ Hits        54624    56122    +1498     
+ Misses      17781    17509     -272     

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	53.51% <ø> (+5.15%)	⬆️
core/individual.h	32.75% <ø> (ø)
core/interaction_type.h	90.32% <ø> (ø)
core/log_file.cpp	29.52% <ø> (ø)
core/log_file.h	100.00% <ø> (ø)
... and 66 more

... and 5 files with indirect coverage changes

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