Ordering of log levels? #25
Description
I really like the fact that this package captures messages from message(), warning() and stop(). IMO it is a potential killer feature.
However, I miss a simple way to specify that "I want to log all messages of level INFO or higher", etc. As I understand it, currently, one has to specify all levels explicitly in the log_file() call. It would be very useful if the levels were ordered, for instance DEBUG > INFO > (SIMPLE)MESSAGE > WARN = SIMPLEWARNING > ERROR > SIMPLEERROR = CRITICAL.
Other logging systems I've seen do this by assigning a numerical value to each symbolic log level, and then test for >= num_log_level. Would it be possible to implement something like this in loggr? I think it would be very useful, and it would also make it easy to add custom log levels.