Started to write a reference manual. Right now it just lists the names of the function, though. String API is changed in incompatible way. Reader and printer are modified to handle it. Numerical code revisited.
Analytical functions start working on complex numbers.
Also several bugs around VM and numeric code are fixed. Added almost complete set of SRFI-13, a rich string library. It's a configure-time choice. Finally gcd and lcm are implemented. Three R5RS string routines are extended as in SRFI-13.