* configure.ac: updated the requirements
* INSTALL.lyx: updated install instructions
* run: removed obsolete file
* src/components/ogre/EmberEntity.cpp, src/components/ogre/MotionManager.cpp: fixed a bug where a moving entity which got deleted caused a segfault
* src/components/ogre/widgets/ModelEdit.lua: fixed a bug where the preview wasn't updated when adding new submodels
* updated INSTALL, TODO and README texts
* added support to the config file for fog distance and camera movement
* added some more error checking code. If some media is missing it should only report the error and continue.