cli: notmuch address option defaults update

cli: notmuch address option defaults update

When no --output option were given, change default to display senders
only.

When only --count option is given, display senders (in contrary to not
displaying anything).

Document that --count with --sort=**order** is not supported option
combination.

Clean up some whitespace in the documentation.

One test updated to have --output=count without sender nor recipient
output option.