I've renamed test line2dIntersect to testLine2d and added new tests there (lazy).
Similar fixes for integers should be done in line3d, but can't do that now, so has to wait.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@4076 dfc29bdd-3216-0410-991c-e03cc46cb475