Fixed getColumnCells issue (was not implemented)


git-svn-id: http://casacore.googlecode.com/svn/branches/nrao-nov12@21354 6afa274c-0927-0410-9b47-a1284d797885
Needed to add ImageAttr*.h


git-svn-id: http://casacore.googlecode.com/svn/branches/nrao-nov12@21355 6afa274c-0927-0410-9b47-a1284d797885