Merged from trunk -r11724:11733

   Merged from trunk -r11724:11733

   | 11725   | When creating the temporary $DISTDIR, do not try to set the  |
   | zmedico | uid since it will fail when not running as root.             |

   | 11726   | Enable bashrc even when $EBUILD_PHASE is unset, so it's      |
   | zmedico | possible to override things like INSTALL_MASK.               |

   | 11727   | In fetch(), avoid the "Adjusting permissions recursively"    |
   | zmedico | message in cases when the directory has just been created    |
   |         | and therefore it must be empty.                              |

   | 11728   | Return early from fetch() if no uris are given.              |
   | zmedico |                                                              |

   | 11729   | Pass $ROOT into portage.util.getlibpaths().                  |
   | zmedico |                                                              |

   | 11730   | Pass $ROOT into the LinkageMap._ObjectKey constructor since  |
   | zmedico | it's needed for os.stat() and realpath() calls.              |

   | 11731   | Fix incorrect $ROOT handling inside dblink._preserve_libs(). |
   | zmedico |                                                              |

   | 11732   | Make SetConfig.getSetAtoms() raise a PackageSetNotFound      |
   | zmedico | exception when necessary and add handling code in emerge.    |
   |         | This solves an unhandled KeyError that was raise when a      |
   |         | nested set did not exist. Thanks to ABCD for reporting.      |

   | 11733   | Fix some incorrect $ROOT handling inside LinkageMap.         |
   | zmedico |                                                              |

svn path=/main/branches/prefix/; revision=11736