Author: Paul Holden
MDL-80192 reportbuilder: ensure filter form group elements have labels.
This ensures compliance with the following WCAG criterion:
"H71: Providing a description for groups of form controls using fieldset
and legend elements".
http://git.moodle.org/gw?p=moodle.git;a=commit;h=3aac83edc4d168be232cdba5c72f1cf7af0217a9
http://github.com/moodle/moodle/commit/3aac83edc4d168be232cdba5c72f1cf7af0217a9
+ 4.2 en [formactions,core_form]