float opdigits(string name) This function will return the
numeric value of the last set of consecutive digits in a node's
name. It is used when building several similar networks. This
expression expects a path to a node, if the node doesn't exist,
it will return 0. opdigits(".") means the digits of the node
that the expression is in. Tip: It is the same as the variable
opdigits("..") means the digits of the parent of the node. Tip:
It is the same as the variable opdigits("../..") is the digits
of the parent of the parent. opdigits("/obj/geo22") = 22
opdigits("..") = 7 (if the current component is named geo7 for
example)