Log.pm: If nofile=1 in the constructor, do not create file
Log.pm: If nofile=1 in the constructor, do not create file

If $nofile is used in the constructor, LoxBerry::Log should not even create an (empty) file.

LoxBerry::Log no can be used without file at all, and print everything to STDERR. It's easy to later enable logging to file.

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