heading. The anchors are derived form the text of the section
heading as described in README. This makes it easy to insert
links that jump from one part of a document to another:
for example, '[back to the Introduction](#Introduction)'.
git-svn-id: https://pandoc.googlecode.com/svn/trunk@246 788f1e2b-df1e-0410-8736-df70ead52e1b