ENH: Reporting the == operator in ImageKeywordlist

Modules/Adapters/OSSIMAdapters/include/otbImageKeywordlist.h

@@ -127,6 +127,7 @@ public:
 
   ImageKeywordlist(const Self &);
   void operator =(const Self&);
+  bool operator ==(const Self&);
 
 protected:
   /** Methods invoked by Print() to print information about the object

Modules/Adapters/OSSIMAdapters/src/otbImageKeywordlist.cxx

@@ -58,6 +58,13 @@ operator =(const Self& p)
   m_Keywordlist = p.m_Keywordlist;
 }
 
+bool
+ImageKeywordlist::
+operator ==(const Self& p)
+{
+  return m_Keywordlist == p.m_Keywordlist;
+}
+
 void
 ImageKeywordlist::
 SetKeywordlist(const ossimKeywordlist& kwl)