introduce strategies #79

Job	Run time
Tests with HiGHS (branch-and-bound/test_bab_knapsack_HiGHS)	8m 41s
Tests with Mosek (branch-and-bound/test_bab_knapsack_Mosek)	11m 11s
Tests with modeling interface	3m 14s
Tests with GLPK (branch-and-bound/test_bab_knapsack_GLPK)	4m 27s
Tests with HiGHS (branch-and-bound/test_bab_location_HiGHS)	12m 7s
Tests with GLPK (branch-and-bound/test_bab_location_GLPK)	4m 46s
Tests with Mosek (branch-and-bound/test_bab_location_Mosek)	6m 50s
Tests with HiGHS (branch-and-price/test_bap_assignment_HiGHS)	11m 23s
Tests with Mosek (branch-and-price/test_bap_assignment_Mosek)	8m 12s
Tests with GLPK (branch-and-price/test_bap_assignment_GLPK)	5m 32s
Upload coverage report	24s
	1h 16m 47s

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