make check error

[Brian Gough]

Matt Newville writes:
 > FAIL: qag(f3,31pt) oscill abserr (1.28571716286847917e-14 observed vs 1.28580546442745926e-14 expected)
 > FAIL: qag(f3,31pt) oscill neval (403 observed vs 31 expected)
 > FAIL: qag(f3,31pt) oscill last (7 observed vs 1 expected)

Do these errors go away with -O0 ? This function also involves
volatile. Perhaps handling of volatile is slightly different with this
compiler -- it is suspicious that the other integration tests all
pass (they don't use volatile).

See the KNOWN-PROBLEMS file for info on the monte failures.