Merged from trunk -r15795:15815

   Merged from trunk -r15795:15815

   | 15802   | Use ewarn output style to add some color.                    |
   | zmedico |                                                              |

   | 15803   | Add periods.                                                 |
   | zmedico |                                                              |

   | 15804   | Merge libc asap for all roots instead of just ROOT="/".      |
   | zmedico |                                                              |

   | 15809   | Disable implicit libc deps for ROOT != "/" since it's        |
   | zmedico | probably not needed.                                         |

   | 15810   | Only create implicit libc deps when the version changes.     |
   | zmedico |                                                              |

   | 15813   | Only try to merge portage asap when the new version is       |
   | zmedico | different.                                                   |

svn path=/main/branches/prefix/; revision=15817