In automos, mapmos, and handmos, when an image is placed twice (usually...

In automos, mapmos, and handmos, when an image is placed twice (usually because the longitude range is greater than 360 and encompasses the image more than once) only hte last occurance was written to the log file. This has been fixed so that there is an entry in the log file for every image placement. ProcessMosaic, added a PvlObject, m_imagePositions, to store the image information (file name, start sample, and start line). An accessor, image Positions(), for the PvlObject was added. The image information is used as log output by automos, handmos, and mapmos. Fixes #976.

git-svn-id: http://subversion.wr.usgs.gov/repos/prog/isis3/trunk@4754 41f8697f-d340-4b68-9986-7bafba869bb8