Replaced deprecated split() function

Replaced deprecated split() function with preg_split() (for RegExp) or
explode() (for Strings).
Updated ADOdb to v4.992

ADOdb 4.992 from 2009 is the last release with PHP4 support. Any newer
release drops the PHP4 support.
Bugfix to create path to sql files correctly

And removed reference assignments in config.php