Implement multi-cut

[odow]

cc @dukduque

[codecov]

Codecov Report

Merging #185 into master will decrease coverage by 0.09%.
The diff coverage is 91.52%.

@@            Coverage Diff            @@
##           master     #185     +/-   ##
=========================================
- Coverage   89.57%   89.47%   -0.1%     
=========================================
  Files          11       11             
  Lines         863      903     +40     
=========================================
+ Hits          773      808     +35     
- Misses         90       95      +5

Impacted Files	Coverage Δ
src/plugins/headers.jl	45.45% <0%> (ø)	⬆️
src/algorithm.jl	97.65% <100%> (+0.01%)	⬆️
src/user_interface.jl	96.87% <100%> (ø)	⬆️
src/plugins/bellman_functions.jl	93.78% <92.1%> (-2.15%)	⬇️

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