Organize API documentation + Fix bug in SIWT + Improve unit test

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[codecov-commenter]

Codecov Report

Merging #58 (d59ef3a) into master (f8af952) will increase coverage by 1.42%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #58      +/-   ##
==========================================
+ Coverage   96.78%   98.21%   +1.42%     
==========================================
  Files          30       30              
  Lines        3302     3302              
==========================================
+ Hits         3196     3243      +47     
+ Misses        106       59      -47     

Impacted Files	Coverage Δ
src/mod/siwt/siwt_bestbasis.jl	100.00% <ø> (ø)
src/mod/siwt/siwt_one_level.jl	92.95% <ø> (+40.84%)	⬆️
src/mod/siwt/siwt_utls.jl	100.00% <ø> (+8.06%)	⬆️
src/mod/SIWT.jl	100.00% <100.00%> (+23.63%)	⬆️

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