Fixes.

Added support for help text in custom fields.
Reimplemented the mechanism how campaign_messages are created.

server/setup/sql/upgrade-00034.sql

@@ -0,0 +1,11 @@
+# Header section
+# Define incrementing schema version number
+SET @schema_version = '34';
+
+# Add template field for group elements
+ALTER TABLE `custom_fields` ADD COLUMN `description` text AFTER `name`;
+
+# Footer section
+LOCK TABLES `settings` WRITE;
+INSERT INTO `settings` (`key`, `value`) VALUES('db_schema_version', @schema_version) ON DUPLICATE KEY UPDATE `value`=@schema_version;
+UNLOCK TABLES;