Modified FindInvalidData's behaviour regarding animation channels
Futher work on the IRR scene and IRRMESH loaders. Q3D fix.
Updated aiNodeAnim documentation.
git-svn-id: https://assimp.svn.sourceforge.net/svnroot/assimp/trunk@218 67173fc5-114c-0410-ac8e-9d2fd5bffc1f