+/** Provide a log setting as if it were passed on the command line.
+ *
+ * Expected syntax:
+ * ( [category] "." [keyword] ":" value (" ")... )...
+ *
+ * where [category] is one the category names (see @ref XBT_log_cats for a complete list of the ones defined in the
+ * SimGrid library) and keyword is one of the following:
+ *
+ * - threshold: category's threshold priority. Possible values:
+ * TRACE,DEBUG,VERBOSE,INFO,WARNING,ERROR,CRITICAL
+ * - add or additivity: whether the logging actions must be passed to the parent category.
+ * Possible values: 0, 1, no, yes, on, off.
+ * Default value: yes.
+ * - fmt: the format to use. See @ref log_use_conf_fmt for more information.
+ * - app or appender: the appender to use. See @ref log_use_conf_app for more information.
+ */