Merged from trunk -r14117:14127

   Merged from trunk -r14117:14127

   | 14118    | Note that package.* and use.* as directories is only        |
   | zmedico  | supported since portage-2.1.6.7, and it is not included in  |
   |          | PMS at this time.                                           |

   | 14119    | Avoid potential empty lines in warnings about missing       |
   | arfrever | SONAMEs or NEEDED entries. Found by Zac Medico.             |

   | 14120    | Add support for --selective=n, so it can be used to remove  |
   | zmedico  | selective behavior that may have been implied by some other |
   |          | option like --update.                                       |

   | 14121    | Add support for --keep-going=n so that it can be disabled   |
   | zmedico  | on the command line after it's been enabled in              |
   |          | EMERGE_DEFAULT_OPTS.                                        |

   | 14122    | Add some --debug output for backtracking. Also, remove      |
   | zmedico  | unused imports.                                             |

   | 14124    | Bug #282269 - Avoid str() calls with overlay paths, which   |
   | zmedico  | can trigger UnicodeEncodeError in python-2.x.               |

   | 14125    | Bug #282306 - Inside dblink._security_check(), fall back to |
   | zmedico  | utf_8 encoding it a path cannot be encoded under the user's |
   |          | chosen encoding.                                            |

   | 14126    | Bug #282269, comment #2 - Avoid potential                   |
   | zmedico  | UnicodeEncodeError when writing to sys.stderr inside        |
   |          | xtermTitle().                                               |

   | 14127    | Support package.provided directory.                         |
   | arfrever |                                                             |

svn path=/main/branches/prefix/; revision=14144