Fix/work around setuptools' evil PYTHONPATH madness.
Add 'type mn -h for details' to usage message.
Workaround for openvswitch_mod rename and pass code check.
Autogenerate man page for mnexec.
Add VERSION string.
Add support for generating man page from mn --help.
Change default controller for mn to ovsc (ovs-controller.)
Also add check to see if another controller is running -eventually we should really detect errors from starting thecontroller!!
Move code from mn into mininet/util to enable reuse
Any code in mn is not usable by other Python code.
Hence, move this code into util, so other scripts can use it.
Rename and document customNode
Now customConstructor, because it general to both links and nodes.
Remove unnecessary and broken --ip option.
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