Merged from trunk 10760:10764

   Merged from trunk 10760:10764

   | 10761   | Bug #228939 - Fix display list interaction with --tree mode  |
   | zmedico | to prevent display of a duplicate list.                      |

   | 10762   | Bug #228977 - Protect against possible infinite loop in      |
   | zmedico | dblink._preserve_libs().                                     |

   | 10763   | Bug #228935 - Add a new "command not found" build log QA     |
   | zmedico | Notice. Thanks to Olivier Huber for the initial patch.       |

   | 10764   | Bug #228977 - During dblink._preserve_libs() calls, cache    |
   | zmedico | results of LinkageMap.findProviders(),                       |
   |         | LinkageMap.findConsumers(), and os.path.realpath() calls in  |
   |         | order to improve performance. This makes a huge difference   |
   |         | in performance for glibc upgrades since glibc provides so    |
   |         | many libs to check consumerge for.                           |

svn path=/main/branches/prefix/; revision=10767