• core.php: add support for a MANTIS_CONFIG environment variable that specifies another config file to load after custom_config_inc.php (useful for apache vhosts)

Thanks to brett-mantis@kavi.com for the patch

git-svn-id: http://mantisbt.svn.sourceforge.net/svnroot/mantisbt/trunk@1522 <a class="text" href="/?p=mantisbt.git;a=object;h=f5dc347c">f5dc347c</a>-c33d-0410-90a0-b07cc1902cb9