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I don't know what this manual is you're going by, by it must be quite old. You can always find the docs for the latest Sage version at http://doc.sagemath.org/

The current release as of writing is 8.3, but 8.1 is not all that old either relatively speaking, and the Sage Combinat package has been built into Sage for quite some time under sage.combinat, and in some cases spread out to other parts of Sage. For example: http://doc.sagemath.org/html/en/reference/quivers/sage/quivers/representation.html

So your best bet if you want to work with specific objects is to read the current documentation on those objects.