bitv_shiftin
static void bitv_shiftin(bitv *bv, unsigned bits, unsigned val);
bitv_shiftin(bv, iterbits, inbv->v[byteindex--]);
bitv_shiftin(bv, 8, inbv->v[byteindex--]);
bitv_shiftin(allbits, 2, 1);
bitv_shiftin(allbits, 2, infop->sizeval);
bitv_shiftin(allbits, infop->csumbits, 0);
bitv_shiftin(allbits, 5, val);
bitv_shiftin(dictval, 1,