shell: added command to print all ignored addresses

Closes #901.
> **Amount** is used in reference to mass nouns (i.e., **uncountable nouns** such as bravery, water, and charisma). **Number** is used in reference to count nouns (i.e., **countable nouns** such as dog, year, and eyeball).
— http://grammarist.com/usage/amount-number/

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