Fix typo.

git-svn-id: https://code.sci.utah.edu/svn/Tuvok@2637 c36c8488-0289-0348-9b64-b301f74bd9a7
linux: force -fopenmp in the .pro files.

needed to compile, so shouldn't be an option.

git-svn-id: https://code.sci.utah.edu/svn/Tuvok@2638 c36c8488-0289-0348-9b64-b301f74bd9a7
Fix a help string.

git-svn-id: https://code.sci.utah.edu/svn/Tuvok@2639 c36c8488-0289-0348-9b64-b301f74bd9a7
Fix OpenGL buffer leak.

FillBBoxVBO gets called a few times, creating a new VBO each time
but not getting rid of the old one.  Use a shared_ptr to make sure
it gets deleted.

git-svn-id: https://code.sci.utah.edu/svn/Tuvok@2640 c36c8488-0289-0348-9b64-b301f74bd9a7