Quality score and trimming in Dada2

@ebolyen

Thanks for the explicit explanations, so in terms of your ASCII graphic examples:

xxxyyyyyyyyyyyyyyyyyyyyyyyyyyyzzzzzzzzzzz                    (forward)
                zzzzzzzzzzzyyyyyyyyyyyyyyyyyyyyyyyyyyyxxx    (reverse)

We need to have at least 20 y's after trunc-len, right?

Thanks,
Bing