Fix devide-by-zero error and update ctest images
Fix slice position init
Update dv3d_slider_test.png
Clones to 'vistrails' no matter the URL
updated Tom's pix with mine, although it looks the same
Merge pull request #896 from UV-CDAT/issue_894_fixes-vistrails-dir-name

Clones to 'vistrails' no matter the URL
Merge pull request #886 from UV-CDAT/vcs3D-fix-unexpected-error-884

Vcs3D fix unexpected error 884

looks good passes all ctest now both on my mac and linux.
Merge branch 'master' into issue_857_logo