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one that lists and allows operations on a number of nodes at once, and
another that allows editing of an individual node.

Split much of the functionality of newnodecheckin.php into a new
library, so it can get re-called from newnodes_list.php3 later.

Move where we look for MACs on the switches - instead of doing in in
newnode, call it from newnodecheckin.php - this provides the admins
more feedback as to what's going on, and allows them to call it again
later or put the information in by hand.