Preparation to update Form after saving values.

save.php: return JSON with updated values of all fields.
AbstractBuildForm.php: updated to deliver values of all form elements
Constants.php: constants to distinguish all or specific values of FEs. QUERY_TYPE_*
Database.php: doSQL now returns affectedrows or lastinsertid in case of udpate/inset. Typos fixed.
QuickFormQuery.php: deliver Values as JSON after save.
Save.php: return lastinsertid or affectedrows.