Add note :NO-FLOATING-POINT-UNDERFLOW-BY-DEFAULT
This note assumes that the implementation purposefully does not conform to 12.1.4.3 by not signaling FLOATING-POINT-UNDERFLOW by default. (The implementation should have an option of toggling this behaviour off in order to be able to signal this condition when underflows occur.) A reason for lack of conformance might be contradictory wording in the spec: 12.1.4.3 mentions that the errors should be signaled, while arithmetic operations mention that they "might signal" the error. Tests EXP{T,}.{8,9,10,11} have been annotated with this note.
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