ENH: For consistency, include config.php and pdo.php first

SVN revision: 3447
ENH: For consistency, always use '/' forward slashes for $cdashpath

SVN revision: 3448
ENH: Use passthru instead of direct include in the autoremovebuilds test

Avoids the autoremovebuilds test failure due to failed error_log calls on the
Windows XP dashboard submitter.

SVN revision: 3449