red vs spmod



Setting red as the default gcd, the testsuite reports 206 errors. Initially, these 
are quotient by zero errors, but eventually, the errors are "context: too many contexts." 

In a fresh Maxima, some (all?) of the tests that give a "too many contexts" error run OK 
with gcd : red. A quotient by zero bug is (Maxima 5.24 has this defect too) (rtest16, test 158)

(%i5) integrate((sqrt(2-2*x^2) * (sqrt(2) + sqrt(2) * x^2))/(4-4*x^2),x,0,1), gcd : red;
`quotient' by `zero'
 -- an error. To debug this try: debugmode(true);

--Barton