Fixed cnetextract's latlon test case by modifying cnetextract.cpp. Modified...

Fixed cnetextract's latlon test case by modifying cnetextract.cpp. Modified the conditional statements in ExtractLatLonRange() to properly check the serial number filename map. Also, modified ExtractLatLonRange()'s signature so that the QVector's used in the output summary are passed-by-reference out parameters.

git-svn-id: http://subversion.wr.usgs.gov/repos/prog/isis3/branches/ipce@7145 41f8697f-d340-4b68-9986-7bafba869bb8