Summary:
SQL syntax for LIMIT doesn't work for PostgreSQL
Detailed Description:
Anywhere LIMIT is used (like getting the list of questions to display) is broken
when using PostgreSQL as your CMSMS DBMS.
Fix:
Files: function.admin_questionstab.php, function.default_summary.php
For PostgreSQL, change all occurrences of "LIMIT $startelement,$pagelimit" to
"LIMIT $pagelimit OFFSET $startelement"