Whole section heading is now clickable anchor link
Do not use block section styles when main section does not have markup
Add tests
Merge pull request #272 from hannu/clickable-header

Whole section heading is now clickable anchor link
Merge pull request #274 from hannu/simple-headings

Do not use block section styles when main section does not have markup
Feature: if section does not use variables, list variables from sub-sections