docs and NEWS for the new tests

src/python/test/README.md

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+### Integration/performance tests
+
+Tests here are meant to be run on a box with an Observatory meta/data dump
+loaded and ready to be tested against the API.
+
+The local Python needs the requirements in `src/python/requirements.txt`.
+
+In order to find and access the correct database, the `PGUSER`, `PGPASSWORD`,
+`PGHOST`, `PGPORT` and `PGDATABASE` env variables should be set.
+
+Tests should be executed as follows:
+
+     nosetests test/autotest.py
+     nosetests -s test/perftest.py