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/histogrampanel.cc

@@ -371,7 +371,7 @@ int histrgbupdate (void* data) {
 
     gdk_threads_enter ();
 
-    HistogramRGBAreaIdleHelper* harih = (HistogramRGBAreaIdleHelper*)data;
+    HistogramRGBAreaIdleHelper* harih = static_cast<HistogramRGBAreaIdleHelper*>(data);
 
     if (harih->destroyed) {
         if (harih->pending == 1)
@@ -533,7 +533,7 @@ void HistogramArea::updateOptions (bool r, bool g, bool b, bool l, bool raw) {
 
 int histupdateUI (void* data) {
 
-    HistogramAreaIdleHelper* haih = (HistogramAreaIdleHelper*)data;
+    HistogramAreaIdleHelper* haih = static_cast<HistogramAreaIdleHelper*>(data);
 
     if (haih->destroyed) {
         if (haih->pending == 1)