Merged from trunk -r13813:13824

   Merged from trunk -r13813:13824

   | 13814    | Assign 'cfgprot' before referencing it. Reported by Thomas  |
   | arfrever | Sachau.                                                     |

   | 13815    | Optimize USE_EXPAND -> USE code inside config.setcpv().     |
   | zmedico  | Thanks to Marat Radchenko <slonopotamusorama@gmail.com> for |
   |          | this patch from bug #276813.                                |

   | 13816    | Bug #137562 - Implement backtracking for missing            |
   | zmedico  | dependencies. Thanks to Sebastian Mingramm (few)            |
   |          | <s.mingramm@gmx.de> for the initial patch which only needed |
   |          | minor changes.                                              |

   | 13817    | Eliminate duplicate code inside                             |
   | zmedico  | depgraph._show_missed_update().                             |

   | 13818    | Move the backtracking code from action_build() to a new     |
   | zmedico  | backtrack_depgraph() function.                              |

   | 13819    | In depgraph._show_missed_update(), don't show installed     |
   | zmedico  | packages since we only want to show available updates.      |

   | 13820    | Improve description of QA_DT_HASH.                          |
   | arfrever |                                                             |

   | 13821    | Remove leading slash from appropriate paths inside          |
   | zmedico  | portage.const, so that lstrip(os.sep) is not needed for     |
   |          | os.path.join() calls. Thanks to Fabian Groffen              |
   |          | <grobian@g.o> for this patch.                               |

   | 13822    | Allow search and depgraph to avoid spinner by using         |
   | volkmar  | spinner=None                                                |

   | 13823    | Optimize USE_EXPAND -> USE code inside config.setcpv().     |
   | zmedico  | Thanks to Marat Radchenko <slonopotamusorama@gmail.com> for |
   |          | the initial patch from bug #276813.                         |

   | 13824    | fix up spacing, remove commented out code, fix copyright    |
   | grobian  | (sort of see-if-I-can-commit test)                          |

svn path=/main/branches/prefix/; revision=13825