Merged from trunk -r13854:13857

   Merged from trunk -r13854:13857

   | 13855   | Fix depgraph._show_missed_update() to keep each $ROOT        |
   | zmedico | separate.                                                    |

   | 13856   | Bug #278895 - Make ebuild.sh clean up orphaned processes     |
   | zmedico | that may have been left behind by ebuild phases. This works  |
   |         | by using setsid to create a new login session for the        |
   |         | ebuild.sh process, and `kill -s SIGHUP 0` to send a SIGHUP   |
   |         | signal to all processes in the session. The setsid is        |
   |         | currently not done on the python side since that would cause |
   |         | the sandbox process in the session, and sandbox produces a   |
   |         | warning message if it catches a SIGHUP signal.               |

   | 13857   | Inside die(), only send the signal for subshell die support  |
   | zmedico | when we are actually in a subshell.                          |

svn path=/main/branches/prefix/; revision=13868