Merged from trunk -r14422:14432

   Merged from trunk -r14422:14432

   | 14423    | Add a test case for this issue:                             |
   | zmedico  | http://bugs.python.org/issue5334                            |

   | 14424    | Fix length calculation so it doesn't assume the length of   |
   | zmedico  | the encoded string is the same as the unicode string.       |

   | 14425    | Remove unused imports.                                      |
   | zmedico  |                                                             |

   | 14426    | Use imp.reload() instead of reload() for compatibility with |
   | arfrever | Python 3.                                                   |

   | 14427    | Define __bool__() for compatibility with Python 3.          |
   | arfrever |                                                             |

   | 14428    | Remove ugly code from __len__, since defining __bool__      |
   | zmedico  | fixes the same issue.                                       |

   | 14429    | Fix formatting of sizes with Python 3.                      |
   | arfrever |                                                             |

   | 14430    | Make sure self._allowed_keys are sorted in the table create |
   | zmedico  | statement. They already are sorted, but do it explicitly    |
   |          | here for clarity.                                           |

   | 14431    | Fix UnboundLocalError triggered by atom without category    |
   | zmedico  | for nonexistent package. Thanks to Jeremy Olexa             |
   |          | <darkside@gentoo.org> for reporting.                        |

   | 14432    | Bug #285767 - Add support to to identify and eliminate      |
   | zmedico  | redundant package selections when multiple atoms happen to  |
   |          | specify a version range.                                    |

svn path=/main/branches/prefix/; revision=14438