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17+17+24 bit pi/2 must only be used when subtraction of the first 2 terms in it from the arg is exact. This happens iff the the arg in bits is one of the 2**17[-1] values on each side of (float)(pi/2). Revert to the algorithm in rev.1.7 and only fix its threshold for using the 3-term pi/2. Use the threshold that maximizes the number of values for which the 3-term pi/2 is used, subject to not changing the algorithm for comparing with the threshold. The 3-term pi/2 ends up being used for about half of its usable range (about 64K values on each side).
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