Quiet mode / verbosity levels

[KasperThystrup]

Thanks you so much for your hard work on this software!

A colleague and I are working on a snakemake pipeline, where we use necat for long read correction, which works quite well. However, there are a lot of log lines when running necat correct. These are quite helpful during setup and testing, but rather annoying when running on large experiments.

I suggest you add a quiet mode or a verbosity level mode, for determining which log messages to maintain.