Add `-v`/`--verbose`/`-V`/`--very-verbose` options

[DavidGinzberg]

From source:

...
#TODO: Add a -v/--verbose option for the excessive print statements below. Consider both `-v` `-V` (AKA: VERY VERBOSE, which is currently the default)
...
    for row in table.findAll('tr'):
      print(f"Processing row number {rowcount}")
      rowcount += 1
      cols = row.findAll(['td','th'])
      print(f"Found {len(cols)} columns.")
...

Output during processing is now a little excessive. Some of the output is useful for debugging but should be off by default. Adding verbosity flags gives the user some flexibility here.