Reworked the new HTML renderer. - Report's sub title contains more information about report and machine. - New "summary" section with summaries calculated across:  - Problem's priority  - PHP namespace  - Rule set  - Rule name - Different design. - File paths act as links. - Deep linking possible, problem index acts as an anchor. - Details are hidden by default - can be toggled. - Attempt at printer friendly CSS media-queries.
Reworked the new HTML renderer.
- Report's sub title contains more information about report and machine.
- New "summary" section with summaries calculated across:
 - Problem's priority
 - PHP namespace
 - Rule set
 - Rule name
- Different design.
- File paths act as links.
- Deep linking possible, problem index acts as an anchor.
- Details are hidden by default - can be toggled.
- Attempt at printer friendly CSS media-queries.

(Based on discussion at https://github.com/phpmd/phpmd/pull/529)

phpmd/phpmd