In the qview application, fixed bugs in the Save As functionality. The Alpha...

In the qview application, fixed bugs in the Save As functionality.  The Alpha Cube is now written to the labels when the cube is cropped and the qview application no longer seg faults when saving a cropped cube at full resolution.  Fixes #706.  Fixes #1386

git-svn-id: http://subversion.wr.usgs.gov/repos/prog/isis3/trunk@4961 41f8697f-d340-4b68-9986-7bafba869bb8