Financial functions: part 3

[zgordan-vv]

#356

This change is 

[codecov]

Codecov Report

Merging #361 into master will decrease coverage by 0.01%.
The diff coverage is 58.76%.

@@            Coverage Diff             @@
##           master     #361      +/-   ##
==========================================
- Coverage    54.7%   54.69%   -0.02%     
==========================================
  Files         199      199              
  Lines       16918    17563     +645     
==========================================
+ Hits         9255     9606     +351     
- Misses       6871     7029     +158     
- Partials      792      928     +136

Impacted Files	Coverage Δ
spreadsheet/formula/fnstatistical.go	80.68% <100%> (ø)	⬆️
spreadsheet/formula/fnmathtrig.go	75.95% <100%> (ø)	⬆️
spreadsheet/formula/fnfinance.go	59.59% <57.29%> (-2.58%)	⬇️
spreadsheet/formula/fndatetime.go	64.17% <70.51%> (-1.23%)	⬇️
spreadsheet/formula/fnindex.go	62.84% <71.42%> (+0.07%)	⬆️
spreadsheet/formula/fntext.go	70.92% <83.33%> (+0.06%)	⬆️

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