Portabiliy - Fedora 9, Ubuntu 8

- The custom report limit "report.x.limit" was being used to limit the
  rendered rows in the table.  Instead, there should be something like
  min (limit, actual_rows) used, in Table.cpp.
  The symptom was duplicate tasks in a "task oldest" report, when there
  were less than 10 tasks.

src/Table.cpp

@@ -1032,7 +1032,7 @@ const std::string Table::render (int maximum /* = 0 */)
   // the table that are rendered.
   int limit = mRows;
   if (maximum != 0)
-    limit = maximum;
+    limit = min (maximum, mRows);
 
   // Print all rows.
   for (int row = 0; row < limit; ++row)