This gives more insight about the logs and allow setting fine-tuned
logging rules. The categories are set to only output Info by default
so this allows us to provide more concise logging while keeping the
ability to extract more information for a specific category when
developping or debugging customer issues.
Issue #5647
Calling save() in the CookieJar destructor was problematic. For instance
we sometimes create a new QNAM with a new CookieJar and then call
setCookieJar() on it to assign some other jar. That destroy the fresh
jar and potentially overwrite cookies.
Also explicitly saving the account's cookies when the account is saved
is more explicit and thus more reliable than counting on the Account
destructor to do it.
