remove postponing of nodes #42

Job	Run time
Tests with modeling interface	3m 45s
Tests with GLPK (branch-and-bound/test_bab_knapsack_GLPK)	4m 6s
Tests with Mosek (branch-and-bound/test_bab_knapsack_Mosek)	10m 30s
Tests with HiGHS (branch-and-bound/test_bab_knapsack_HiGHS)	11m 0s
Tests with GLPK (branch-and-bound/test_bab_location_GLPK)	3m 50s
Tests with Mosek (branch-and-bound/test_bab_location_Mosek)	8m 48s
Tests with HiGHS (branch-and-bound/test_bab_location_HiGHS)	10m 37s
Tests with GLPK (branch-and-price/test_bap_assignment_GLPK)	4m 44s
Tests with Mosek (branch-and-price/test_bap_assignment_Mosek)	8m 0s
Tests with HiGHS (branch-and-price/test_bap_assignment_HiGHS)	9m 22s
Upload coverage report	47s
	1h 15m 29s

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