Alefeld shi refreshl close #359

[jverzani]

• reorganizes alefeld, potra, shi code, hewing more closely to the paper
• The reorganization has some performance penalty; if this is noticeable the original can be returned as a special case.
• closes issue Bracketed Halley? #359, though maybe not with the most performant solution

[codecov]

Codecov Report

Patch coverage: 95.33% and project coverage change: +0.90 🎉

Comparison is base (9deede6) 85.29% compared to head (86d27e2) 86.19%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #363      +/-   ##
==========================================
+ Coverage   85.29%   86.19%   +0.90%     
==========================================
  Files          35       35              
  Lines        2135     2159      +24     
==========================================
+ Hits         1821     1861      +40     
+ Misses        314      298      -16     

Impacted Files	Coverage Δ
src/find_zero.jl	95.83% <ø> (ø)
src/trace.jl	28.57% <ø> (ø)
src/Bracketing/alefeld_potra_shi.jl	95.02% <94.82%> (+9.31%)	⬆️
src/Bracketing/bracketing.jl	97.05% <100.00%> (ø)
src/Derivative/halley_like.jl	100.00% <100.00%> (ø)

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