Copyright (C) 2013-2020 Christian Hesse <mail@eworm.de>
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... and fix logging.
Logging with severity from variable (:log $severity ...) is not
possible, this is considered a syntax error. Also the 'workaround' with
parsing code failed with missing message in log.
The reliable code is a lot longer, so merge the two functions to save a
lot of duplicate code.
