RkXfer - change the current candidate
#include <canna/RK.h>
int RkXfer(cxnum, knum)
int cxnum;
int knum;
RkXfer sets the candidate with a specified candidate number knum
as the current candidate. The candidate number must be 0 or greater but less
than the highest candidate number in the current clause. The current clause
does not change when a candidate number outside this range is specified.
If successful, this function moves the current candidate in the context and
returns the candidate number after the move. It returns 0,
without doing anything, if it has been run in a nonconversion mode context.