Msieve function rootopt_callback in poly_skew.c excessive output

[RichardAth]

The problem actually showed up using YAFU to factor a large number > 95 digits. I got 1000s of lines of unwanted output which I eventually tracked down to rootopt_callback.

commenting out the following at around line 58 reduced the output to a managable volume;

printf("save %le %.4lf %.2lf %le rroots %u\n", size_score,
root_score, skewness, combined_score,
num_real_roots);