RkXfer - change the current candidate

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.

RkXfer - change the current candidate

       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.

                                                                                                       RKXFER(3)

#include<canna/RK.h>intRkXfer(cxnum,knum)intcxnum;intknum;