add Group Footer - Repeat as Footer property

As group Header has “repeat as Header” property, which is very useful and  “prints” GH on top of every page even in middle of the group, it would be nice to have this for group footer. 



with this property, group footer will not appear ONLY at the end of group, but also at the end of every page.



Without this, is is extremely difficult (probably impossible) to prevent group footer and footer to be printed right after each other in my conditions.