ADD the common convention to display the active version of bees(d)

[tkuschel]

• In Linux (Unix), the --version command-line argument (or --ver, -V, -h for help) is a common convention to display the version of a program. While it's not a literal function call, the shell interprets this as a command-line argument that tells the program to execute its built-in version-checking routine and print the result to the terminal. E.g., ls --version outputs the version of the ls command.
• added that functionality with parameters --version as well as -V to output the version on stdout and then exit;
• Changes:

1. The default bees_log_level from 8 to 7, because the output of the version get some debugging messages too. Due to this behaviour, I will change the template with a default line OPTIONS="--verbose 8"

Issue: #330

BR Thomas