Fixes to smoke test.

[zestyping]

This makes some fixes and improvements to the smoke test:

• Incremental sync is now properly exercised, by changing a patient's location on the server without changing it locally, and then waiting for the sync to pull down the change.
• The test now looks for changes in patient counts based on previously seen patient counts, so the test is robust to existing patients.
• The test no longer relies on the PatientChartController to expose the current patient's location UUID.
• There is better logging for web click operations.
• The scroll buttons in the chart are exercised; the view is scrolled down to the bottom so the operations on orders are visible.
• There is a toast at the end indicating success.