change gap computation #106

Job	Run time
Tests with HiGHS (branch-and-bound/test_bab_knapsack_HiGHS)	7m 21s
Tests with GLPK (branch-and-bound/test_bab_knapsack_GLPK)	4m 28s
Tests with modeling interface	3m 54s
Tests with HiGHS (branch-and-bound/test_bab_location_HiGHS)	6m 37s
Tests with Mosek (branch-and-bound/test_bab_knapsack_Mosek)	11m 3s
Tests with GLPK (branch-and-bound/test_bab_location_GLPK)	4m 5s
Tests with HiGHS (branch-and-price/test_bap_assignment_HiGHS)	10m 41s
Tests with Mosek (branch-and-bound/test_bab_location_Mosek)	6m 51s
Tests with GLPK (branch-and-price/test_bap_assignment_GLPK)	6m 50s
Tests with Mosek (branch-and-price/test_bap_assignment_Mosek)	12m 23s
Upload coverage report	0s
	1h 14m 13s

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