YAML2 Transition
     
     * YAML.pm moved to YAML::Old
     * YAML2 *dist* installs YAML *module*
     * With lots of warnings
       * VERY EXPERIMENTAL
       * WARNING- ***INGY CODE!!!***
     * YAML2 proxies to the appropriate
       YAML implementation module.
     * When stable, make YAML2 into real YAML.pm.
     
       use YAML;
       use YAML-Old;
       use YAML '-Old';
       use YAML-XS,-Perl;