Tests

add minimal support for quadratic expressions #531

Job	Run time
Mosek Wrapper (branch-and-bound/test_bab_knapsack_Mosek)	5m 47s
HiGHS Wrapper (branch-and-bound/test_bab_knapsack_HiGHS)	6m 56s
GLPK Wrapper (branch-and-bound/test_bab_knapsack_GLPK)	3m 11s
Modeling Interface	2m 24s
Mosek Wrapper (branch-and-bound/test_bab_location_Mosek)	4m 46s
GLPK Wrapper (branch-and-bound/test_bab_location_GLPK)	3m 9s
HiGHS Wrapper (branch-and-bound/test_bab_location_HiGHS)	6m 22s
GLPK Wrapper (branch-and-price/test_bap_assignment_GLPK)	3m 35s
Mosek Wrapper (branch-and-price/test_bap_assignment_Mosek)	8m 56s
HiGHS Wrapper (branch-and-price/test_bap_assignment_HiGHS)	8m 14s
Coverage Report	11s
	53m 31s

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