RFC-91: add doxygen comment blocks for new classes

Modules/Wrappers/ApplicationEngine/include/otbLogger.h

@@ -26,6 +26,13 @@
 
 namespace otb {
 
+/** \class Logger
+ *  \brief An ITK logger specialized for OTB
+ *
+ *  Sets OTB wide settings in its constructor
+ *
+ * \ingroup OTBApplicationEngine
+ */
 class Logger : public itk::Logger
 {
 public:

Modules/Wrappers/ApplicationEngine/include/otbWrapperApplication.h

@@ -41,6 +41,13 @@
 namespace otb
 {
 
+/** \class ApplicationException
+ *  \brief Exception for runtime errors in OTB Applications
+ *
+ *  Usually thrown with the otbAppLogFATAL macro
+ *
+ * \ingroup OTBApplicationEngine
+ */
 class ApplicationException : public itk::ExceptionObject
 {
 public: