Implement #60 - SPF Best guess

[jcbf]

No description provided.

[codecov]

Codecov Report

Merging #61 into master will decrease coverage by 0.32%.
The diff coverage is 86.11%.

@@            Coverage Diff             @@
##           master      #61      +/-   ##
==========================================
- Coverage   86.81%   86.48%   -0.33%     
==========================================
  Files           1        1              
  Lines         508      518      +10     
==========================================
+ Hits          441      448       +7     
- Misses         67       70       +3

Impacted Files	Coverage Δ
smf-spf.c	86.48% <86.11%> (-0.33%)	⬇️

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[coveralls]

Coverage decreased (-2.04%) to 84.924% when pulling f06d3a0 on jcbf/add_bestguess into 479ae56 on master.

[coveralls]

Coverage decreased (-0.3%) to 86.641% when pulling 722f1b4 on jcbf/add_bestguess into 479ae56 on master.