Merged from trunk -r14969:14975

   Merged from trunk -r14969:14975

   | 14970   | Don't assign f to sys.stderr inside EOutput._write().        |
   | zmedico |                                                              |

   | 14971   | When temporarily replacing the sys.std* streams, use the     |
   | zmedico | normal open() func in python3 so that we get the right class |
   |         | (otherwise our code that expects the 'buffer' attribute will |
   |         | break).                                                      |

   | 14972   | Use ImportError handling to import _TextTestResult which     |
   | zmedico | moved from unittest to unittest.runner in python-2.7. Thanks |
   |         | to Arfrever for the suggestion.                              |

   | 14973   | Fix handling for TEMP, TMP, and TMPDIR variables: * Add to   |
   | zmedico | whitelist so current values are always used. * Always filter |
   |         | them from the saved environment. * Always add thier values   |
   |         | to SANDBOX_WRITE.                                            |

   | 14974   | When overridding sys.std* in python2, use binary streams.    |
   | zmedico |                                                              |

   | 14975   | Add localization variables (LANG and LC_*) to the            |
   | zmedico | environment whitelist and filter them from the saved         |
   |         | environment (so user settings override those of binary       |
   |         | packages). Thanks to Fabio Erculiani <lxnay@g.o> for         |
   |         | reporting.                                                   |

svn path=/main/branches/prefix/; revision=14977