[boost] [floating point utilities] Review request

This is a request for a formal review of the Floating Point Utilities library. The library contains the following: 1. Floating point number classfication functions: fpclassify, isfinite, isinf, isnan, isnormal (Follows TR1) 2. Sign bit functions: signbit, copysign, changesign (Follows TR1) 3. Facets that format and parse infinity and NaN according to the C99 standard. (These can be used for portable handling of infinity and NaN in text streams.) The library is available in the vault in the folder Math-Numerics. --Johan Råde