NAME
       PGASetCharacterAllele   -   sets   the   value   of   an  allele  in  a
       PGA_DATATYPE_CHARACTER string.
INPUT PARAMETERS
       ctx    - context variable
       p      - string index
       pop    - symbolic constant of the population the string is in
       i      - allele index
       val    - character value to set the allele to
OUTPUT PARAMETERS
       side   -effect.
SYNOPSIS
       #include "pgapack.h"
       void  PGASetCharacterAllele(ctx, p, pop, i, value)
       PGAContext *ctx
       int p
       int pop
       int i
       char value
LOCATION
       char.c
EXAMPLE
       Copies the alleles from member p in PGA_OLDPOP to member q in PGA_NEWPOP.
       Assumes the strings are of the same length.
       PGAContext *ctx;
       int p, q, i;
       :
       for (i=PGAGetStringLength(ctx)-1; i>=0; i--)
       PGASetCharacterAllele(ctx, q, PGA_NEWPOP, i,
       PGAGetCharacterAllele(ctx, p, PGA_OLDPOP, i))
                                   05/01/95           PGASetCharacterAllele(1)