Merged from trunk -r14567:14577

   Merged from trunk -r14567:14577

   | 14568    | Set EPYTHON variable as empty when calling portageq or      |
   | arfrever | dohtml to avoid using potentially unsupported version of    |
   |          | Python.                                                     |

   | 14570    | Add some more EPYTHON safety.                               |
   | zmedico  |                                                             |

   | 14573    | Fix python shebangs. s:/usr/bin/env python:/usr/bin/python: |
   | zmedico  |                                                             |

   | 14575    | Add a xpak-helper.py script, so that shell code always      |
   | zmedico  | calls python via a shebang.                                 |

   | 14577    | Bug #288551 - Fix portageq to handle                        |
   | zmedico  | portage.exception.AmbiguousPackageName instead of           |
   |          | ValueError.                                                 |

svn path=/main/branches/prefix/; revision=14603