Merged from trunk -r15053:15056

   Merged from trunk -r15053:15056

   | 15054   | In movefile mtime preservation code, simply round down to    |
   | zmedico | the nearest whole second since python's float cannot         |
   |         | preserve the st_mtim.tv_nsec field with complete precision.  |
   |         | Note that we have to use stat_obj[stat.ST_MTIME] here        |
   |         | because the float stat_obj.st_mtime rounds *up* sometimes.   |

   | 15055   | Bug #296641 - Avoid UnicodeEncodeError with python2 in       |
   | zmedico | eapi_is_supported() triggered by corrupt EAPI.               |

   | 15056   | Inside depgraph._validate_blockers(), do not consider        |
   | zmedico | blockers in DEPEND of installed packages, since DEPEND is    |
   |         | supposed to be irrelevant for packages after they are built. |

svn path=/main/branches/prefix/; revision=15117