Hammer CLI

I'm adding some implementation notes.

At the moment -v has the same effect as -d - it prints logs to stdout. I don't think it was a good choice and in my opinion we should keep only -d for that purpose. At the same time I think it would be confusing for users if we suddenly started using that flag for something else. We should deprecate it first. --verbosity or something similar could be used from the start (it's longer I know).

Verbosity should be added to following places in hammer output:

• add verbosity attribute to #print_message, default is 1
• add verbosity attribute to #print_error, not sure what the default value should be here
• add verbosity to fields in output definition
  All those messages/fields would be printed only when their verbosity is <= than what a user asked for.

Verbosity should also be configurable in settings.
In order to keep the current behavior unless user explicitly changes the settings, I think that what Lukas describes should be verbosity 0 and default should be 1 (or some other value, but one step higher).

PS: Pagination details in #print_record methods should probably be printed only with higher verbosities.