#845742 by Damien Tournoud: Make Bartik the default core theme.

includes/theme.inc

includes/theme.maintenance.inc

modules/block/block.admin.inc

modules/block/block.module

modules/block/block.test

modules/blog/blog.test

modules/color/color.test

modules/forum/forum.test

modules/node/node.test

modules/simpletest/tests/menu.test

modules/statistics/statistics.test

modules/system/system.admin.inc

modules/system/system.install

profiles/minimal/minimal.install

profiles/standard/standard.install