Use of GROUP_CONCAT () limited by group_concat_max_len value

Using GROUP_CONCAT () will use the group_concat_max_len system value, this defaults to 1024 (http://dev.mysql.com/doc/refman/5.0/en/server-system-variables.html#sysv...). If you are on a shared web host you will not be able to change this setting.

Updating code to remove use of GROUP_CONCAT () on component types 'textarea' and 'matrix'. Patch to follow.

This is for 7.x-1.x-dev branch, so have added the issue for 6.x-1.3 as a related issue.