Merged from trunk -r14896:14906

   Merged from trunk -r14896:14906

   | 14897   | In movefile(), skip os.utime() when os.rename() succeeds, in |
   | zmedico | order to completely preserve mtime resolution.               |

   | 14898   | Fix logic from previous commit so it only applies when a     |
   | zmedico | 'newmtime' parameter has not been specified (this is always  |
   |         | the case when called by portage).                            |

   | 14899   | In calc_depclean(), load the FakeVartree before using it.    |
   | zmedico | This fixes a regression which causes incomplete graph        |
   |         | creation (since r14773). Thanks to Vlastimil Babka           |
   |         | <caster@g.o> for reporting.                                  |

   | 14900   | Add a note about lack of nanosecond precision in movefile(). |
   | zmedico |                                                              |

   | 14901   | Handle a KeyError in depgraph._ordered_tree_display(),       |
   | zmedico | reported on irc by romildo.                                  |

svn path=/main/branches/prefix/; revision=14937