fixed style error
Catching exceptions thrown in mn
Display usage information if there are extra argumentsFixes #130
Remove non-functional --prefixlen (use --ipbase instead)
mn: change default passive listening port to 6634
Becomes consistent with the OpenFlow walkthrough & MN walkthrough web pages.
pep8: Fix E501 line-too-long errors incurred fixing other pep8 stuff :-)
pep8: fix E128 continuation line under-indented errors
I wasn't sure this was worth fixing at first, but it does look more readablenow.
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.
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