fix: issue2551238 - roundup-server should exit with error ... if -d <pidfile> is used without -l <logfile>. Now exits with error if -l or -L are not specified with -d. This exposed a problem with relative paths when using a logging config file. -d enables deamon mode by default. This changes the current direcory to /. So relative paths in a logging config file are opened in / and fail. Added documentation to dmin guide noting the problem.

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