BP constant is defined the wrong way

[Michael Sebel]

Just installed sddCMS on a IIS which had notices turned on. In that
case, IIS isn't giving any output to the client. Great.

However it's because the BP constant is defined the following way:

define(BP,realpath($_SERVER['DOCUMENT_ROOT']));

But it should be:

define('BP',realpath($_SERVER['DOCUMENT_ROOT']));

..for PHP to not give a notice. Also, all constants are missing at the installer.