- Reversed change in vector3d::normalize. The check for 0 vector isn't there for optimization, but to prevent NAN values.
  Works now again as documented and a corresponding test has been added.
  Does fix bug 2770709 (https://sourceforge.net/tracker/?func=detail&aid=2770709&group_id=74339&atid=540676)
- Animations can now be paused by setting the fps to 0.
- Avoid fp-precision problem in getPickedNodeBB (see also 
http://irrlicht.sourceforge.net/phpBB2/viewtopic.php?t=33838&highlight=). 
  This change might also fix the problem with picking nodes found by aanderse 
(http://irrlicht.sourceforge.net/phpBB2/viewtopic.php?t=32890&highlight=)



git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@2419 dfc29bdd-3216-0410-991c-e03cc46cb475