ENH: Add function to split the Covariant Vector Image into its components

git-svn-id: https://farsight-svn.ee.uh.edu/repos/farsight/trunk@4729 9053f808-4e3f-0410-9672-ef3bfcbbeb84
WIP: Start seed detection by GVF

git-svn-id: https://farsight-svn.ee.uh.edu/repos/farsight/trunk@4730 9053f808-4e3f-0410-9672-ef3bfcbbeb84