When logging NSErrors, include domain and code

[jksk]

Currently, it seems that localizedFailureReason, localizedDescription, localizedRecoverySuggestion and localizedRecoveryOptions are being logged. Curiously, error domain and error code aren't logged. Often, this is the most pertinent information.

Case in point: I have some logged errors which only contains the description "The operation couldn't be completed", and no other information. This makes them hard to track.