2. Admin should be able to lock the user, as currently it only unlocks it via
user management dialog.
3. There were some indefinite login page loading issues when trying to log in
with invalid password, where it should redirect to the login page again instead.
refs #6337 (Initial patch by Khushboo Vashi)
- Reformat source so it's wrapped.
- Standardise markup.
- Center images.
- Restructure in various places to improve the indexing.
- Remove duplicated Query Tool toolbar descriptions.
- Ensure the structure works in both HTML and LaTeX.