Adds MOI.LOCALLY_SOLVED as an acceptable return code for hchebyshevcenter()

[ferrolho]

Example code for the matter:

hchebyshevcenter(polyhedron(vrep(rand(10, 3))), with_optimizer(Ipopt.Optimizer, print_level=0))

Output before change:

Solver returned LOCALLY_SOLVED when computing the H-Chebyshev center.

Stacktrace:
 [1] error(::String) at ./error.jl:33
 [2] hchebyshevcenter(::DefaultPolyhedron{Float64,MixedMatHRep{Float64,Array{Float64,2}},MixedMatVRep{Float64,Array{Float64,2}}}, ::OptimizerFactory) at /home/henrique/.julia/dev/Polyhedra/src/center.jl:35
 [3] top-level scope at In[92]:1

Output after change:

([0.664083, 0.515307, 0.583585], 0.270949718678351)

[coveralls]

Coverage remained the same at 82.81% when pulling be87101f35a57e0f1b72c0b0329d55a1cd7c96f6 on ferrolho:master into ffb0574e67e9b0f56544bd47eaac992fa6240802 on JuliaPolyhedra:master.

[codecov[bot]]

Codecov Report

Merging #177 into master will not change coverage. The diff coverage is 100%.

@@           Coverage Diff           @@
##           master     #177   +/-   ##
=======================================
  Coverage   83.88%   83.88%           
=======================================
  Files          32       32           
  Lines        1812     1812           
=======================================
  Hits         1520     1520           
  Misses        292      292

Impacted Files	Coverage Δ
src/center.jl	94.59% <100%> (ø)	:arrow_up:

---

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 ffb0574...be87101. Read the comment docs.

[codecov[bot]]

Codecov Report

Merging #177 into master will not change coverage. The diff coverage is 100%.

@@           Coverage Diff           @@
##           master     #177   +/-   ##
=======================================
  Coverage   83.88%   83.88%           
=======================================
  Files          32       32           
  Lines        1812     1812           
=======================================
  Hits         1520     1520           
  Misses        292      292

Impacted Files	Coverage Δ
src/center.jl	94.59% <100%> (ø)	:arrow_up:

---

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 ffb0574...be87101. Read the comment docs.