This adds the `sysvmq` package which handles SysV IPC message queues.
For consistency the parameter for `permissions` is renamed to `mode`
also for POSIX message queues.
To supporte more than a single log level `log` and `env_logger` crates
are used. For the application to support the different type of
argument, the verbose argument definition was adapted.
This subcommand receives one or more messages from a queue. Three
different methods are supported, read message by message, read until a
given timout or read until a specified date and time. This subcommand
also supports the `--non-blocking` flag.
The create command creates a new message queue with support of the
typical parameters `mode`, `capacity` and `msgsize`. This command also
supports the global argument `verbose`.
