same time args passed to def() are used
  by other elements of the <%def> tag.
  [ticket:191]

- add conditionals to pygments-dependent tests that ensure
pygments 1.4, separate check for no pygments.

least remove huge lines

  strict_undefined=True, will cause
  variables not found in the context to
  raise a NameError immediately, instead of
  defaulting to the UNDEFINED value.

  such that if no traceback is passed
  and sys.exc_info() has been reset,
  the formatter just returns blank
  for the "traceback" portion.
  [ticket:135]
- some long line cleanup

- Python 3 support is added ! See README.py3k
  for installation and testing notes.
  [ticket:119]

HTML file writing, consistently cleanup the modules/cache directories, use
nose skiptests for unsupported features.