Merged from trunk -r12652:12664

   Merged from trunk -r12652:12664

   | 12653   | Optimize depgraph._dep_expand() to avoid calling             |
   | zmedico | pordbapi.cp_all(), since it can be more efficient to call    |
   |         | cp_list() on each category. Thanks to Marat Radchenko        |
   |         | <slonopotamusorama@gmail.com> for the suggestion.            |

   | 12654   | Make isvalidatom() identify empty slot as invalid (missing   |
   | zmedico | slot is valid) and add a corresponding test case.            |

   | 12655   | When displaying the list of failed packages, tell the number |
   | zmedico | that failed. Thanks to Jeremy Olexa <darkside@g.o> for the   |
   |         | suggestion.                                                  |

   | 12656   | Add back Rev to svn:keywords (accidentally removed when      |
   | zmedico | setting Id). Thanks to ABCD for reporting.                   |

   | 12658   | Try to fix svn:keywords again.                               |
   | zmedico |                                                              |

   | 12659   | Try to fix svn:keywords again.                               |
   | zmedico |                                                              |

   | 12661   | Add a new portage.utils.lazy_import() function which behaves |
   | zmedico | similar to the snakeoil.demandload.demandload() function.    |

   | 12662   | Fix StringIO imports so that 2to3 can handle them. Also,     |
   | zmedico | replace shlex + StringIO usage with shlex.split() where      |
   |         | appropriate.                                                 |

   | 12663   | In python-3.0, integer division results in a float, so       |
   | zmedico | convert back to int.                                         |

   | 12664   | Add a cross reference from FEATURES=lmirror docs to the      |
   | zmedico | "local" mirror docs in portage(5).                           |

svn path=/main/branches/prefix/; revision=12670