Geometric functions

[seajane]

Adding new functions for geometric mean, median, standard deviation and quantiles.

[codecov-commenter]

Codecov Report

Merging #82 (a5b8adb) into develop (4443eaf) will decrease coverage by 1.18%.
The diff coverage is 98.27%.

❗ Current head a5b8adb differs from pull request most recent head d236907. Consider uploading reports for the commit d236907 to get more accurate results

@@             Coverage Diff             @@
##           develop      #82      +/-   ##
===========================================
- Coverage    93.33%   92.15%   -1.19%     
===========================================
  Files           10       11       +1     
  Lines          885      943      +58     
===========================================
+ Hits           826      869      +43     
- Misses          59       74      +15     

Impacted Files	Coverage Δ
R/geometric_functions.R	98.27% <98.27%> (ø)
R/reproducibility_tables.R	60.91% <0.00%> (-16.10%)	⬇️

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