- fixed "texture dimension must be power of two" error in older video cards - new sky texture
- fixed "texture dimension must be power of two" error in older video cards
- new sky texture

git-svn-id: 6a538601d1c922f78546b6a71dadc076bcde9bff@22201 6e01202a-0783-4428-890a-84243c50cc2b

concord-consortium/energy3d