Tutorial part 5, step 6: added ruler support
Tutorial part 5, step 5: added support for images
Tutorial part 5, step 4: added support for hyperlinks
Tutorial part 5, step 3: added support for pre-formatted text
Tutorial part 5, step 2: added list support
Tutorial part 5, step 1: added Headline support
Tutorial part 5, step 0 (preparation): run export of test cases from Makefile
Tagged tutorial part 4
Tutorial part 4, step 7: added Unicode support to character filter
Tutorial part 4, step 6: added text style and formatting functions
