Partially solving issue 1788: "Crashing during processing of queue"

It also correct a bug of wrong image orientation (was wrong in the File Browser while good in the Editor tab)

This patch also introduce several speed optimizations like:
   - switch between File Browser and Editor tab in Single Editor mode
   - asynchronous computation of the Batch Queue's thumbnails
   - quick start of RT even with a huge queue
   - less GUI overhead when applying a profile to multiple thumbs in the File Browser

rtgui/profilechangelistener.h

@@ -25,9 +25,19 @@
 class ProfileChangeListener {
 
     public:
+        virtual     ~ProfileChangeListener() {}
         virtual void profileChange  (const rtengine::procparams::PartialProfile* nparams, rtengine::ProcEvent event, const Glib::ustring& descr, const ParamsEdited* paramsEdited=NULL) {}
         virtual void setDefaults    (rtengine::procparams::ProcParams* defparams) {}
 };
 
+class BatchProfileChangeListener {
+
+    public:
+        virtual     ~BatchProfileChangeListener() {}
+        virtual void beginBatchProfileChange(int numberOfEntries) {}
+        virtual void endBatchProfileChange() {}
+};
+
+
 #endif