Launch VirtualBox VM and attach to serial console

(like xm create -c) I ported an older Mac OS X specific shell magic to GNU/Linux, see the old post for details. I also created a @Github gist.
Related resources

1. http://www.telecom.otago.ac.nz/tele301/student_html/subnetfw-serial-terminal.html
2. http://howtoware.blogspot.mx/2012/01/oracle-vm-virtualbox-how-to-use-serial.html

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