GitLab

Some minor cleanup/commenting as well.

Also, a few more access checks. Only admins are able to run 'inuse' (to prevent
users from seeing each other's experiments.) You are also only allowed to run
tbreport for experiments in projects that you are trusted by.

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.

things, although this solution is not hugely better ...

	BOSSNODE=boss.emulab.net
	USERNODE=users.emulab.net
	OURDOMAIN=emulab.net