Pipette and "On Preview Widgets" branch. See issue 227

The pipette part is already working quite nice but need to be finished. The widgets part needs more work...

clean.sh

@@ -0,0 +1,28 @@
+#!/bin/sh
+find -name CMakeCache.txt -delete
+rm install_manifest.txt
+
+rm -r ./CMakeFiles 
+rm -r ./rtengine/CMakeFiles
+rm -r ./rtexif/CMakeFiles
+rm -r ./rtgui/CMakeFiles
+rm -r ./rtdata/CMakeFiles
+
+rm ./cmake*
+rm ./rtengine/cmake*
+rm ./rtexif/cmake*
+rm ./rtgui/cmake*
+rm ./rtdata/cmake*
+
+rm ./Makefile
+rm ./rtengine/Makefile
+rm ./rtexif/Makefile
+rm ./rtgui/Makefile
+rm ./rtdata/Makefile
+
+rm ./rtengine/librtengine.so
+rm ./rtengine/librtengine.a
+rm ./rtgui/rawtherapee
+rm ./rtexif/librtexif.so
+rm ./rtexif/librtexif.a
+exit 0