Z-Machine floating-point library

The library provides IEEE 754 conformant floating point arithmetic for the Z-machine. It is supplied as a standard Inform header file, and uses only around 24K of code/string space, plus a few dozen bytes of dynamic memory.

This is the second release (Release 1/2, 26th March 2002) of the library. Its APIs and function names are potentially subject to change. All feedback welcome.