Add layout weights

[codecov-commenter]

Codecov Report

Merging #105 (3d6a8d2) into master (ee25764) will decrease coverage by 0.26%. The diff coverage is 93.18%.

@@            Coverage Diff             @@
##           master     #105      +/-   ##
==========================================
- Coverage   94.07%   93.80%   -0.27%     
==========================================
  Files          14       14              
  Lines         742      775      +33     
==========================================
+ Hits          698      727      +29     
- Misses         44       48       +4     

Impacted Files	Coverage Δ
src/core/options.jl	100.00% <ø> (ø)
src/layouts/common.jl	94.79% <90.00%> (-1.32%)	:arrow_down:
src/plots/plot_processing.jl	88.00% <90.00%> (+1.04%)	:arrow_up:
src/core/data.jl	100.00% <100.00%> (ø)
src/core/types.jl	100.00% <100.00%> (ø)
src/layouts/kamada_kawaii_layout.jl	94.25% <100.00%> (ø)
src/plots/plot.jl	96.25% <100.00%> (+0.21%)	:arrow_up:
src/layouts/SFDP_fixed_layout.jl	91.78% <0.00%> (-2.74%)	:arrow_down:

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