- force update on RAW files without process when default process change
- prevent to pass arbitrary strings to dcraw

git-svn-id: https://scale-ability.fr/svn/github/Not-So-Original/trunk@1244 744bd327-0465-4c9b-be31-35d8739af2d3
added the ability to stack astronomy pictures

git-svn-id: https://scale-ability.fr/svn/github/Not-So-Original/trunk@1245 744bd327-0465-4c9b-be31-35d8739af2d3