Fix hit and run sampler

[stelmo]

Fix hit and run sampler to be production ready

[codecov]

Codecov Report

Merging #251 (4198efd) into master (e70a9da) will increase coverage by 0.32%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #251      +/-   ##
==========================================
+ Coverage   89.47%   89.80%   +0.32%     
==========================================
  Files          49       49              
  Lines        1150     1138      -12     
==========================================
- Hits         1029     1022       -7     
+ Misses        121      116       -5     

Impacted Files	Coverage Δ
src/base/utils/StandardModel.jl	64.17% <ø> (-3.83%)	⬇️
src/analysis/flux_variability_analysis.jl	97.29% <100.00%> (+0.52%)	⬆️
src/analysis/sampling/affine_hit_and_run.jl	100.00% <100.00%> (ø)
src/analysis/sampling/warmup_variability.jl	100.00% <100.00%> (ø)
src/base/solver.jl	100.00% <100.00%> (ø)

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[stelmo]

@exaexa so here are the almost working sampler functions. Basically everything works in serial, but the wheels fall of as soon as I add any compute nodes on my pc. See the testing functions test\analysis\sampling*.jl. I think the problem originates in warmup.jl... but I have no clue about what exactly the problem is or how to fix it