From 29e18aa39b34621813edb730875ea607fbace789 Mon Sep 17 00:00:00 2001
From: Frank Wuerthwein
getDS(n)
+getDSNames()
Return an object of type RRDDS holding - the information about the n-th Data - Source.
+Return the names of the Data + Sources present in the RRD file. +
getDSbyName(name)
+getDS(id)
Return an object of type RRDDS holding +
If id is a number, return an object of type RRDDS holding + the information about the id-th Data + Source.
+If id is a string, return an object of type RRDDS holding the information about the Data Source with the requested name.
-If no DS has such name, undefined is returned.