Converted the descriptive chapters of the html docs to doxygen format
and modified index.dox accordingly.
This checkin includes only trivial reformatting, no major rewriting.
Added a chapter "Migrating Code from FLTK 1.1 to 1.3".
All links on the main page are working now.
Todo:
- Check doxygen error messages, rewrite pages (html tags, contents).
- Fill the new "Migrating..." chapter.
git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3@6224 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
