Merged from trunk 10716:10726

   Merged from trunk 10716:10726

   | 10717   | Bug #228075 - Explicitly call gc.collect() to try and free   |
   | zmedico | memory when checking for blockers. This avoids a heap        |
   |         | overflow that triggers 'Cannot allocate memory' errors       |
   |         | (reported with python-2.5).                                  |

   | 10723   | Refactor the 'inherit.autotools' and 'IUSE.undefined' checks |
   | zmedico | into classes derived from LineCheck.                         |

   | 10725   | Pass a Package instance into LineCheck.new(), and use this   |
   | zmedico | to avoid passing the ebuild mtime into the EbuildHeader      |
   |         | constructor (the mtime is given when the new() method is     |
   |         | called).                                                     |

svn path=/main/branches/prefix/; revision=10728