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

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.93%. Comparing base (b7d413d) to head (d9aa4a6).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #531      +/-   ##
==========================================
+ Coverage   75.72%   76.93%   +1.20%     
==========================================
  Files         114      117       +3     
  Lines       72808    78701    +5893     
  Branches    12878    14289    +1411     
==========================================
+ Hits        55133    60545    +5412     
- Misses      17675    18156     +481     

Files with missing lines	Coverage Δ
core/chromosome.cpp	71.83% <ø> (+0.77%)	⬆️
core/chromosome.h	52.85% <ø> (+4.37%)	⬆️
core/community.cpp	80.65% <ø> (+0.44%)	⬆️
core/community.h	100.00% <ø> (ø)
core/community_eidos.cpp	90.59% <ø> (-0.71%)	⬇️
core/genomic_element.cpp	68.88% <ø> (ø)
core/genomic_element.h	100.00% <ø> (ø)
core/genomic_element_type.cpp	82.62% <ø> (+0.63%)	⬆️
core/genomic_element_type.h	100.00% <ø> (ø)
core/haplosome.cpp	50.04% <ø> (+0.84%)	⬆️
... and 3 more

... and 77 files with indirect coverage changes

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