Slight reorg of the Mysql interface code; move all the DBQuery* stuff
into a new module called emdbi.pm, and reexport the symbol names back out. This allows me to import just the db interface code to the Geni modules I am writing, without having to drag in 4000 lines of other crap that is Emulab specific. This change is invisible to the Emulab code, although I did it without any perl exporter/importer magic incantations; did it the old fashioned way.
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