Feature: show actual numbers on Network and Storage IO

Signed-off-by: Kirill Enykeev <enykeev@gmail.com>
Feature: make data limits configurable

Signed-off-by: Kirill Enykeev <enykeev@gmail.com>
Feature: fetch details with period's resolution

Signed-off-by: Kirill Enykeev <enykeev@gmail.com>