Address linktest problems reported by Mike in issue #160:
1. Changes to gentopofile to not put in linktest info for links and lan with only one member. 2. Fix to the CM for deletenode of a node that has tagged links. 3. Fixes to the status web page for deletenode; we were installing the linktest event handlers multiple times. 4. Pass through -N argument to linktest from the CM, when the experiment has NFS mounts turned off, so that we use loghole to gather the data files (instead of via NFS). This closes issues #160.
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