Use cached datasets in tests and examples

Use cached datasets in tests and examples

Also remove a download that isn't actually used in that example.

This allows the tests to pass, and at least some of the examples to
be built, in an offline environment such as a Debian buildd.

The cached data is extracted from R packages by debian/datasets/*.

Author: Diane Trout <diane@ghic.org>, Rebecca N. Palmer <rebecca_palmer@zoho.com>
Forwarded: not-needed

Gbp-Pq: Name use-cached-datasets