add a line break between result count and the < > controls

[dietuyt]

In the inital view everything is at the same line;

Showing 101 to 110 of 184900 << < 7 8 9 10 11 12 13 14 15 16 > >> 

But if the of X is too long, the line breaks. Better to have both at a different line:

Showing 101 to 110 of 184900 
<< < 7 8 9 10 11 12 13 14 15 16 > >> 

[herste]

Investigated and not easy to do as we use the Wicket AjaxFallbackDefaultDataTable?.
If deemed important enough we can write our own DataTable? implementation, but the default does implement all the basic stuff you need. (e.g., showing X to Y of Z results, and so on).