modified repository layout
updated ossim-demosaic; writing output using ossimTiffWriter class
added two ossim apps; some swig files and minor changes in pyossim
added ossim imagestack app and ossim white balance
added imagestack with modification for ossim;
added some headers
remove imstack from demosaic app is ossim-app
added new ossim-app colorcovert
added new .i files
updating app files