Updated documentation and reviewed coding standards for MatrixGraphicsScene,...

Updated documentation and reviewed coding standards for MatrixGraphicsScene, MatrixGraphicsView, MatrixOptions, and MatrixOptionsDialog in preparation to add these classes to trunk. Fixes #4081.

git-svn-id: http://subversion.wr.usgs.gov/repos/prog/isis3/branches/ipce@6893 41f8697f-d340-4b68-9986-7bafba869bb8