Add more info to stdout

Long logfiles like https://scientists.virgo-gw.eu/DataAnalysis/DetCharDev/dqr/preO4/202208/S220808g/omicronscanfull8192/logs/3506763-0-omicronscanfull8192-slot1_6@olnode31.virgo.infn.it.out would benefit from being "lightened" and less repetitive. => A few suggestions for the line

Omicron::NewChannel: load a new channel...

• Add a blank line before each occurrence (assuming this is when a new channel starts being processed)
• Add the name of the new channel which is being processed
• Add information about the progress of the global processing: for instance channel N / N_{tot}, (XX% done).