Updated the Advanced Track Tool to include a help menu and a help dialog that...

Updated the Advanced Track Tool to include a help menu and a help dialog that opesn with the tool and when the user opens it through the help menu. Fixes #772.

git-svn-id: http://subversion.wr.usgs.gov/repos/prog/isis3/trunk@4532 41f8697f-d340-4b68-9986-7bafba869bb8