Lib-ification. These scripts have been changed from using the Mysql module to
using the libdb library. They have also been cleaned up somewhat, with more comments added, etc. I've merged nodeip and mac2if, which had very similar functions. The merged version goes under the name nodeip. Lastly, I've added some access checks to db2ns and node_status, to make sure they're only called by the right people.
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