- Added an #abstract? method
- Added an #abstract? method

- Added code to #classDefinition to set the ::new method to the correct
  visibility depending on its abstract- or concrete-ness.

--HG--
extra : convert_revision : svn%3A39a105f4-52d6-0310-bb1b-d6517044f2e4/trunk%40501

ged/mues