Removed obsolete test comment.
Simpler code.
Moved Python 2.6+ only tests to the right place.
Imported more general robust_align from master_python2.4.
Imported fixed robust_align from master_python2.3.
Fixed test for Python 2.6.
Put back PDF (LaTeX) generation.
Adapted the documentation to LaTeX/PDF: superscripts are not directly recognized by LaTeX, and :sup: cannot be nested in code. Superscript were moved from code examples to the main text.