ChangeLog

not released yet:
  * Fix the array exercises (there were bugged and not properly
    integrated into po4a)
  * various improvements to the french translation
  * Remove the "clear session" menu entry
  * Graphical consistency between menu choosing the human language,
    and the one choosing the programming language
20111006e:
  * Allow to code in python, javascript or ruby
  * Definitely kill the linearity of lessons (combobox removed)
  * Load the lessons on need only (and save them separately from each
    other)
  * Cleanup the way identica and twitter get informed of student
    progress
  * Textual display of what's wrong when the world is not what's
    expected
  * implement the world equality for logo
  * Allow to have lectures, ie non-interactive exercises
  * Improved turmite track, with a specific view displaying the step
20110909:
  * New exercise track on turmites
  * Enforce that the buggles cannot move to outer space with
    setPos(), setX(), setY() nor peek outer space with getCell()
20110907:
  * Add a new lesson navigator allowing to break the lesson linearity
  * Use identi.ca in addition to twitter to push the success of students