Adding /VGrange/ PNG files per sea bird species * (season or year) showing the...

Adding /VGrange/ PNG files per sea bird species * (season or year) showing the range of years (last-first = range) with observation from surveys feeding into the seabird density maps. Higher is better.

git-svn-id: file:///data/vcs/svn/wozep/06_KEC_update@85 2644bf9d-2702-4baa-a01c-52b3410d9c0d