add a check to redirect from old upgrade.php to new install.php once
database has been created with install.php, or databases are in sync
fixed failure to record upgrade marking new release in upgrade*.php

git-svn-id: http://mantisbt.svn.sourceforge.net/svnroot/mantisbt/trunk@3730 <a class="text" href="/?p=mantisbt.git;a=object;h=f5dc347c">f5dc347c</a>-c33d-0410-90a0-b07cc1902cb9