Bugfix: proper verbosity of the messages

User should be able to select the verbosity of the progress/diagnostic
messages using the `-v` switch.
Feature: `servers show` shows default server

If server name is not provided as an argument to `servers show`, the
default server will be shown (if any).
Bugfix: should not fetch in offline mode

Fetching from a server only makes sense in online mode.
Cleanup: copy/paste errors
Cleanup: remove unused code
Cleanup: whitespace and commented out code