Merged from trunk 10557:10566

   Merged from trunk 10557:10566

   | 10558   | Fix regex for compatibility with the regex implementation    |
   | zmedico | from FreeBSD's libc (used by bash on FreeBSD). Thanks to     |
   |         | Alexis Ballier <aballier@g.o> for the patch.                 |

   | 10560   | Avoid an unhandled IndexError thrown from the                |
   | zmedico | PackagesSystemSet constructor when neither /etc/make.profile |
   |         | nor /etc/portage/profile exist.                              |

   | 10561   | Make PackagesSystemSet.description refer to the real profile |
   | zmedico | rather than /etc/portage/profile when possible.              |

   | 10563   | Update --depclean and package.provided docs to indicate      |
   | zmedico | interaction between them.                                    |

   | 10564   | Use a distdir_writable variable in fetch(), for better       |
   | zmedico | control of write operations inside ${DISTDIR}.               |

   | 10566   | Fix typo.                                                    |
   | zmedico |                                                              |

svn path=/main/branches/prefix/; revision=10576