History of changes to inline-math:

1.0 20APR95 Initial version.
1.1 28APR95 Fixed bug in sgn(x); replaced macros with inline functions.
1.2 28APR95 Introduced more efficient alogrithm for log1p(x).
1.3 04MAY95 Fixed bug in tan(x); allow compilation under gcc -ansi.
1.4 16MAY95 Allow compilation under g++ -pedantic.
1.5 12JUN95 Removed copysign; sgn1(x) and sgn(x) simplified and return double.
