getters & doc for Reformulation

[guimarqu]

fix #366

[codecov]

Codecov Report

Merging #367 into master will decrease coverage by 0.00%.
The diff coverage is 85.71%.

@@            Coverage Diff             @@
##           master     #367      +/-   ##
==========================================
- Coverage   76.04%   76.03%   -0.01%     
==========================================
  Files          51       51              
  Lines        3761     3764       +3     
==========================================
+ Hits         2860     2862       +2     
- Misses        901      902       +1     

Impacted Files	Coverage Δ
src/Algorithm/preprocessing.jl	52.25% <ø> (ø)
src/MathProg/MathProg.jl	100.00% <ø> (ø)
src/MathProg/reformulation.jl	47.82% <83.33%> (+2.82%)	⬆️
src/MathProg/decomposition.jl	94.35% <100.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update a148dd1...cee996e. Read the comment docs.