A simple-to-use logger with verbosity levels that outputs by default to stderr (changeable at runtime) with the date and time at the beginning of each log message.
Set this ref to the lowest level of log you want logged. For example, Easy.level := `always disables all logging except that at the `always level. Setting Easy.level := `info will enable logging for `info, `warn, `error, `fatal and `always levels.
val output : unit BatIO.output refSet this ref to the output you want logging messages to go to. Defaults to stderr.
val log : ?fp:string -> easy_lev -> string -> unitlog lev msg logs the message msg if the current logging level is lev or lower.
val logf : ?fp:string -> easy_lev -> ('a, unit BatIO.output, unit) format -> 'aAs log, but instead of a string message, a printf format is allowed with whatever arguments are appropriate.