Pull Request to fix cal3-minMax ages bug #19

[dwbapst]

Fixes #19 and implements tests so this behavior never occurs again.

[codecov-io]

Codecov Report

Merging #24 into master will increase coverage by 6.17%.
The diff coverage is 66.82%.

@@            Coverage Diff             @@
##           master      #24      +/-   ##
==========================================
+ Coverage   16.26%   22.43%   +6.17%     
==========================================
  Files          78       78              
  Lines        8870     8993     +123     
==========================================
+ Hits         1443     2018     +575     
+ Misses       7427     6975     -452

Impacted Files	Coverage Δ
R/timePaleoPhy.R	20.22% <ø> (ø)	⬆️
R/cal3TimePaleoPhy.R	58.08% <66.82%> (+58.08%)	⬆️
R/taxa2phylo.R	79.33% <0%> (+12%)	⬆️
R/durationFreq.R	28.96% <0%> (+28.96%)	⬆️
R/pqr2Ps.R	43.75% <0%> (+43.75%)	⬆️
R/dateNodes.R	64.7% <0%> (+64.7%)	⬆️
R/taxa2cladogram.R	83.33% <0%> (+83.33%)	⬆️

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