Use the documented 5 line prolog in every sample application. Tidy up sample prologs and header code.

samples/getopt-test.cpp

@@ -103,6 +103,9 @@ int main(int argc, char** const argv)
 {
 	Exiv2::XmpParser::initialize();
 	::atexit(Exiv2::XmpParser::terminate);
+#ifdef EXIV2_ENABLE_BMFF
+    Exiv2::enableBMFF();
+#endif
 
 	int n;