More homogeneous code #628

Job	Run time
Julia 1.6 - ubuntu-latest - x64 - pull_request	19m 16s
Julia 1 - ubuntu-latest - x64 - pull_request	23m 52s
benchmark (run_benchmarks_jump.jl)	7m 39s
benchmark (run_benchmarks.jl)	7m 20s
benchmark (run_benders_quantile_regression_benchmark.jl)	2m 44s
benchmark (run_benchmarks_pmedian.jl)	2m 34s
Julia 1.6 - ubuntu-latest - x86 - pull_request	23m 1s
	1h 26m 26s

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