t is created, if not existing.
    	<br/>In case this account already exists, it is <i>added</i> the set of privileges
    	applying to <strong>existing_grantee</strong>, and its password is updated. 
	</li>
  </ul>
  Both <strong>existing_grantee</strong> and <strong>new_grantee</strong> can be provided in
  <i>relaxed</i> format: <strong>'web_user@10.0.0.%'</strong> is a valid input, and is
  implicitly translated to "<strong>'web_user'@'10.0.0.%'</strong>", which is the fully
  qualified account name.
</