Remove nca

[PharmCat]

Remove NCA, freq, CI, ds (all moved to MetidaProject)

• Stay only samplesize, power, randomization  #68
• Remove NCA, DS  #67
• Remove proportion confidence intervals from API #65
• Remove DataFrames #52

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +4.54 🎉

Comparison is base (378e40c) 80.80% compared to head (d555ffd) 85.34%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #66      +/-   ##
==========================================
+ Coverage   80.80%   85.34%   +4.54%     
==========================================
  Files          20       13       -7     
  Lines        2146      962    -1184     
==========================================
- Hits         1734      821     -913     
+ Misses        412      141     -271     

Impacted Files	Coverage Δ
src/ClinicalTrialUtilities.jl	100.00% <ø> (ø)
src/hypothesis.jl	90.90% <ø> (-9.10%)	⬇️
src/show.jl	66.03% <ø> (+4.85%)	⬆️
src/owensq.jl	100.00% <100.00%> (ø)
src/powertost.jl	96.25% <100.00%> (+3.65%)	⬆️
src/samplesize.jl	89.47% <100.00%> (-0.68%)	⬇️
src/utilities.jl	100.00% <100.00%> (ø)

... and 11 files with indirect coverage changes

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