"Testing adj"

clear

T = adj(((a,b),(c,d)))
check(T = ((d,-b),(-c,a)))
T = adj(((1,2),(3,4)))
check(T = ((4,-2),(-3,1)))
T = adj(((2,3,-2,5),(6,-2,1,4),(5,10,3,-2),(-1,2,2,3)))
check(T = ((-4,-177,-73,194),(-117,117,-99,-27),(310,-129,-44,-374),(-130,-51,71,-211)))
