In ImageImporter, added the history label to the output cube. In std2isis,...

In ImageImporter, added the history label to the output cube. In std2isis, updated the default app test to make sure the history group is in the resulting cube label. Fixes #1894.

git-svn-id: http://subversion.wr.usgs.gov/repos/prog/isis3/trunk@5704 41f8697f-d340-4b68-9986-7bafba869bb8