In agreement with Peter I removed the leitner system implementation from libkdeedu.

In agreement with Peter I removed the leitner system implementation from libkdeedu.
 - It was never completed
 - It was used in none of our apps, only KWQ had some unfinished functions for it

This does not solve the Leitner implementation problem.
My current plan:
 * Have a Leitner implementation in KDE 4.1
 * Use the lesson class as leitner boxes
   - since kvtml2 entries can be in multiple lessons, no need to reinvent the wheel
   - have svg boxes to display the current state if possible
Details are still to be decided and this is just an idea.
KWordQuiz and Parley should share the implementation.

CCMAIL: peter@peterandlinda.com

svn path=/trunk/KDE/kdeedu/libkdeedu/; revision=727005