Utility functions
=================
These functions, prototyped in `g-wrap.h' and implemented for each
interpreter which g-wrap supports, can be used in the glue functions
for writing strings to Scheme ports and raising Scheme errors.
- Function: void gw_puts (char* STR, GWSCM PORT)
Writes string STR to Scheme port PORT.
- Function: void gw_error (char* MESSAGE)
Raises a Scheme error with string MESSAGE.