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()

rtengine/klt/error.cc

@@ -20,7 +20,7 @@
  * exactly like printf
  */
 
-void KLTError(char *fmt, ...)
+void KLTError(const char *fmt, ...)
 {
   va_list args;
 
@@ -42,7 +42,7 @@ void KLTError(char *fmt, ...)
  * exactly like printf
  */
 
-void KLTWarning(char *fmt, ...)
+void KLTWarning(const char *fmt, ...)
 {
   va_list args;