Merge with e190c52ab7861c68762aaa552f3dc0f59fe2e225 from default

This revision compiles and runs on Win7x64- but further evaluation is necessary.
There may be an issue with cmake step -After cmake I had to copy rtgui/version.h & config.h into out of source build /rtgui folder.
Additional notes:
- ImProcFunctions::hsv2rgb01   -> this likely need to be added to color.h & color.cc
- Use of array2D should be verified in NR code
- compilation warning for rtengine::RawImageSource::isWBProviderReady()

rtgui/preferences.h

@@ -112,6 +112,7 @@ class Preferences : public Gtk::Dialog {
     Gtk::CheckButton* ckbmenuGroupLabel;
     Gtk::CheckButton* ckbmenuGroupFileOperations;
     Gtk::CheckButton* ckbmenuGroupProfileOperations;
+    Gtk::CheckButton* ckbmenuGroupExtProg;
 
     Gtk::CheckButton* chOverwriteOutputFile;