Diaz perez

[jverzani]

Give regula falsi methods some attention:

• uses dispatch for FalsePosition
• adds some names to FalsePosition
• make FalsePosition a type of AbstractRegulaFalsiMethod so that bracket is recorded when traced
• adds new RegulaFalsi methods based on Diaz-Perez parameterization. For those that match FalsePosition's methods, these utiliize the same or fewer function calls
• fixed bug with decide_convergence when brackting method failed to converge; this forced tests to be adjusted

[codecov]

Codecov Report

❌ Patch coverage is 88.05970% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 86.82%. Comparing base (31ca988) to head (57ee77f).

Files with missing lines	Patch %	Lines
src/Bracketing/false_position.jl	73.68%	5 Missing ⚠️
src/Bracketing/regula_falsi.jl	93.61%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #514      +/-   ##
==========================================
- Coverage   86.94%   86.82%   -0.13%     
==========================================
  Files          41       42       +1     
  Lines        2567     2604      +37     
==========================================
+ Hits         2232     2261      +29     
- Misses        335      343       +8     

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