Initialize the interpreter
int SLang_init_slang (void)
The SLang_init_slang function must be called by all
applications that use the S-lang interpreter. It initializes the
interpreter, defines the built-in data types, and adds a set of core
intrinsic functions.
The function returns 0 upon success, or -1 upon failure.
SLang_init_slfile, SLang_init_slmath, SLang_init_slunix