Log Message:
Update to 1.6001

Upstream changes:
1.6001 2012-12-05 10:03:13
    [BUG FIXES]
    - Resolve issue #71: SV leaks in VM frames

1.6000_01 2012-11-04 09:56:45
    - The bytecode version is now 1.6. So all the cache will be discarded.

    [FEATURES]
    - Add opcodes: find_file, suffix, is_code_ref, merge_file in
      order to enhance template syntaxes (doy)