Merged from trunk -r14472:14478

   Merged from trunk -r14472:14478

   | 14474   | Bug #287333 - If posible, use ebuild from tree when checking |
   | zmedico | for keyword mask on installed packages.                      |

   | 14476   | Bug #285832 - When updates are missed due to dependencies    |
   | zmedico | that have been masked by backtracking, abbreviate output in  |
   |         | order to avoid terminal flooding.                            |

   | 14477   | Don't use a fork inside _test_pty_eof() because it gives     |
   | zmedico | inconsistent results.                                        |

   | 14478   | Fix race condition when using a fork inside _test_pty_eof(). |
   | zmedico |                                                              |

svn path=/main/branches/prefix/; revision=14480