Update tools/property_tree support so it builds again.

tools/CMakeLists.txt

@@ -28,6 +28,7 @@ add_executable( property_tree
     EXCLUDE_FROM_ALL
     property_tree.cpp
     ../common/richio.cpp
+    ../common/exceptions.cpp
     ../common/dsnlexer.cpp
     ../common/ptree.cpp
     )

tools/property_tree.cpp

@@ -85,7 +85,7 @@ int main( int argc, char** argv )
     }
     catch( const IO_ERROR& ioe )
     {
-        fprintf( stderr, "%s\n", TO_UTF8( ioe.errorText ) );
+        fprintf( stderr, "%s\n", TO_UTF8( ioe.What() ) );
     }
 }