Remove checks for "export" dir during install
Merge pull request #171 from kp52/develop

Remove checks for "export" dir during install
Only log error if database selectable
Merge pull request #172 from kp52/develop

Only log error if database selectable
Warning comments in settings.inc.php and user_settings.inc.php
Remove superfluous includes of DBAPI abstract class
Install class now extends Core class
Merge branch 'develop' of github.com:ClipperCMS/ClipperCMS into develop