Add Tree Based Issue Tracking

Would like to see Issues displayed in the following manner:

1) each issue represented as a collapsible folder (with the + or - icon in Windows folders)

2) each response represented as a collapsible sub-folder (if there are more than 1 related sub-responses); otherwise, individual responses can be represented as a single thread icons

This allows an user to see which responses correspond to higher-level responses or issues. Such an UI would make Jira visually easier to navigate through all the responses/issues.