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Changes proposed in this Pull Request:

The "Signups vs. Cancellations" and "Signups vs. Expirations" reports have been broken since v3.0. This PR:

1. Fixes those reports (See abstraction in function drawVisualization(). The issue was JS errors caused by [' and <?php being on new lines in the deleted code)
2. Removes unnecessary if ( $type === 'signup_v_cancel' || $type === 'signup_v_expiration' || $type === 'signup_v_all' ) { conditions that always evaluate to true (resulting indentation changes is most of the diff)
3. Adds the raw report data in a table under the chart.

Other information:

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Changelog entry

Enter a summary of all changes on this Pull Request. This will appear in the changelog if accepted.